Budding entrepreneurs work to persuade a panel of tycoons to invest in their business proposals in return for a percentage of equity in the company.

An inner-city teacher tries to sell the Sharks on his unique way to get children to learn; the owner of a gourmet food business watches the Sharks fight for a piece of the action; an astonishing offer is made for one life-saving idea.

An entrepreneurial novice makes a less-than-stellar presentation to the sharks; a father-son duo pitches a proposal for a revolutionary new musical product.

An entrepreneur originally from Ghana wants an investment for an Internet business; a man from California wants to franchise his graffiti-removal business.

Three of the sharks make a deal for an innovative Internet company, but before the deal can be sealed, a battle ensues and one of the sharks is ousted.

A young Chicago entrepreneur plays hardball with the sharks while seeking funding for an innovative Internet business.

A housewife from Charleston, S.C., charms the male sharks; a college student pitches a product made from soy that he creates in his mother's kitchen.

A young entrepreneur's overconfidence could blow a deal with the sharks; Kevin O'Leary follows an entrepreneur out of the Shark Tank to get the last word after being outbid by another shark.

A veterinarian's product claims to prevent cancer in pets; virtual arcade; a Texas designer pitches a line of fashionable clothing for women.

A man wants an investment from the sharks to create an extension of his already successful business; a urologist has an unusual business proposal.

Things get heated when the sharks ask a husband-and-wife team to clarify the actual value of a childcare business; a chef's salad dressing mix is removed from store shelves because of offensive packaging; a golf ball cleaner.

Two Texas bicyclists have an idea for a portable hand degreaser; a college student is passionate about his environmentally friendly clothing line; the sharks find out if lifelong entrepreneur Cactus Jack lost at least 35 pounds to seal a deal.

A California entrepreneur wants to bring back old-fashioned ice cream men; a couple's pitch is about providing legal services at a coffee house; an update on the sharks' venture with an Arizona woman and her unique plush toys.

A man wants an investment from the sharks to create an extension of his already successful business; a urologist has an unusual business proposal.

The Sharks are stunned by the exploits of two sisters with a children's dance company; a chef with tasty seafood products and more

A shark wants to invest $4 million in a business; a toy-rental business; a bacon-scented wake-up call; an update on a deal from last season.

Children seek a backer for an idea spawned during a family trip and the sharks fight for a piece of a mother's furniture business.

Comic Jeff Foxworthy makes his debut as a guest Shark investor; actor Vincent Pastore pitches a business proposition; a flight attendant and her husband present their unique portable child's seat.

An entrepreneur from Chicago hopes the sharks can dig him out of a financial hole; a single mother believes her aromatic lip gloss can help women look and feel beautiful.

An entrepreneur presents a line of luxury maternity gowns; a woman tries to impress the sharks with her homemade cakes; the sharks fight over a stay-at-home dad's product.

A former athlete believes his product can save lives; environmental lawn-mowers; solution to car sickness; kids birthday party franchise.

Tensions rise when Mark Cuban urges entrepreneurs to ignore the other sharks and negotiate only with him.

Maternity T-shirts, a toilet-training kit for cats, extravagant but affordable jewelry, and shoes with interchangeable tops are pitched in the second-season finale. Also: an update on Season 1's Voyage Air Guitar, whose inventors turned down a million-dollar offer from the sharks.

NBA champion Bill Walton helps a triathlete pitch his idea for a unique water bottle; a ghostwriter from California seeks a business investment; two women from Minnesota present their online business that helps people plan their own funerals.

Ideas include a training system for salespeople, a management system for cargo trucks, family-friendly Las Vegas entertainment and a cat-portrait business. Also: a follow-up on a Season 2 potty-training product for cats.

An Illinois perfume peddler; a San Francisco woman selling luxury soap; an Alabama guitar teacher who says his learning system is unique; a “Mr. Mom” from Baton Rouge, La., with accessories for blue jeans. Also: an update on a gourmet seafood business from Season 2.

A towel that provides coverage to change out of a swimsuit in public; a sweater and quilt invention; a way to maximize a wine's life; healthy cake mix

Products include jewelry designed by a 10-year-old and a wedge pillow to allow women with large breasts to sleep comfortably on their stomachs. Also: a way to deal with missing garbage-can lids; a reinvention of “the tea experience”; an update on a peel-and-stick light-up decal for car windows

The Sharks tear into the business idea of a Phoenix, AZ man who wants them to invest in a watch he claims provides health benefits; a stay-at-home mom from Gilbert, AZ could lose her gourmet pretzel business if she leaves the Tank without an investor; a man from Bozeman, MT with a no-tools-required furniture system hopes he can assemble a deal; and an inventor from Fullerton, CA has a small but powerful idea that could make him a millionaire. Also, Johnson Barley from Broken Arrow, OK, whose Original Man Candle did not spark a deal with the Sharks in Season Two, talks about his business since his appearance.

Will Sharks Barbara and Kevin seal a deal with a kiss when two guys from Utah ask them to sample their flavored mix-and-match lip balm kissing product? A self-professed gadget guy from Ketchum, ID calls a Shark’s lucrative offer “insane” regarding his revolutionary clothing item; during their heated negotiation, the entrepreneur calls Apple Computers co-founder Steve Wozniak for advice. A newlywed from Rockledge, FL who lost her job the day before coming to the Tank hopes the Sharks will invest in her and her husband’s line of innovative, clever kitchen products; and a husband from Derby, KS pitches the Sharks a heat-recycling device which his wife calls “common sense in a box.” Also, a follow-up on Greenville, SC’s Kim Nelson’s homemade Daisy Cakes, which Barbara invested in during Season 2.

Pitches include body jewelry, a movable basketball-training apparatus, an organic skin-care product and a “Rent-a-Grandma” business. Also: an update on a Season 1 barbecue restaurant.

Singer Ingrid Michaelson joins a would-be entrepreneur who's pitching high-tech music software. Other pitches include an "instant" solution for cellulite; a sales distribution method for a stand-up paddleboard; and a wine-aerating device. Also: a follow-up on a Season 3 magnetic clip to secure eyeglasses.

A returning entrepreneur asks Boston Beer chairman Jim Koch for advice on his wine-in-a-cup business. Other pitches include handmade cookies; T-shirts with motivational messages that become visible when the wearer perspires; and products made from the waste emitted from the entrepreneur's generator.

Things get heated when the sharks deal with a husband-and-wife team.

Tempers flare and insults fly when the Sharks fight over an innovative three-in-one nail polish invented by a mother of six girls from West Hartford, CT, who had to sell her engagement ring to start her business. A husband and wife team of feisty New Yorkers believe they have the next big thing in women's accessories; two Pittsburgh hockey moms pitch their home-grown tank top business with interchangeable straps; and a couple from Pasadena, CA insist that their unique sippy cups be manufactured in the USA to maintain quality. In a follow up story, the entrepreneurs behind Talbott Teas from Chicago, IL have big news about a deal with Jamba Juice after their TV appearance.

The sharks attempt to make the big deal.

Billy Blanks Jr. asks the sharks to invest in a dance fitness program; a music producer seeks an investment in a rock band; two college students pitch their flavored peanut butter business.

The sharks fight for a chance to go into business with an inventor; two fitness trainers pitch their idea for a unique home gym; a young man seeks an investment in his age-defying products.

History is made when all five Sharks join forces to make a deal. Also, a recent college graduate from Indianapolis, IN wants to turn inconvenience into opportunity with his ticketless coat check system; a man from Central City, CO wants the Sharks to invest in his belt buckle idea that doubles as a beverage holder; a licensed massage therapist from Phoenix, AZ takes a stand to reinvigorate the ancient art of body massage; and two women from Freehold, NJ believe they have a solution to the nationwide epidemic of bedbugs. Also, an update on Rick Hopper from Fullerton, CA and his Readerest eyeglass holder, which Lori Greiner invested in during Season 3.

When a man from Austin, TX pitches a so-called "cheaters app" -- which allows selected contacts to be hidden from view when calls come in -- the Sharks question and debate the morality of investing in an app that could be used to make it easier for people in relationships to cheat. Also, two business partners from Bedford, NH have top-ranked champion surfer Lakey Peterson demonstrate to the Sharks how their surf-inspired exercise equipment works; a dapper man from Acworth, GA pitches a personal style system that will help the Average Joe look and feel like an alpha male; and two women from Omaha, NE hope to make a sweet deal where customers can design their own personalized ice cream and gelato flavors. In addition, there will be an update on the recent success of Tower Paddle Boards, a business Mark Cuban invested in with Stephan Aarstol from San Diego, CA.

Professional dancers Jonathan Roberts and Anna Trebunskaya demonstrate their posture correction device; entertainment reporter Robin Leach and a designer from Florida present stone-studded leather jewelry; a gluten-free cookie business.

An unemployed man and his pregnant wife pitch a party-favorite chicken dip; a professional football player's spring-loaded laundry hamper, a technophobe presents his wireless gadget that helps people keep track of their keys or cell phone.

A line of dresses made of pillowcases; a unique spatula; vitamin oral sprays; energy-boosting waffles.

Professional football player Brandon Jacobs hopes to help a woman find success with her protein-infused energy drink; a lobster roll food truck; eco-friendly cleaning products; colorful drink insulators; follow-up on a lip balm idea.

A modern-day slip business; a scrubbing tool; dog-friendly frozen yogurt; an electric unicycle; an update on the "Lollacup."

Seth MacFarlane shows his support for a man who designed a new fly trap; multi-functional child cover; food storage container; followup on a manicure system.

A motorized vehicle suit; comedy writer Bruce Vilanch presents a computer instruction project; sugar-free candy chips; an update on a foldable guitar.

An energy and nutritional supplement designed and tested by active members of the military; a new way to shop for bridal wear; a wine tasting cruise.

A rent-a-live Christmas tree service; gluten-free fudge; cell phone accessory; indoor/outdoor play space; singer John Rich surprises an entrepreneur.

Mark and Lori offer an entrepreneur $1 million; enclosed tabletop food screen; a beer and arcade game cabinet; peel-off face paint transfer; hair care products for children; update on Squirrel Nut Butter.

A capsule that keeps beverages hot for an extended period; a new way to clean stuffed toys; reinventing the ice cream experience.

Sandals for barefoot runners; a magnetic sound enhancer that doesn't need power; a website that creates personalized soundtracks for children; an update on "Cousins Lobster.

A successful entrepreneur returns with a new business idea; hand-held cooler; environmentally friendly dry cleaning bag; chewing tobacco alternative.

Kevin O'Leary makes a $1 million offer; six young inventors aged 12 to 18 present their unsafe-driving detector; a mini-muffin that is a twist on s'mores; an online chat therapy business.

Unique eyewear made of sustainable wood; a camouflage clothing line for duck hunters; a premium denim line; high-end bedding for girls.

Fortified, sugar-free nut butters; an acupressure wrist band; an at-home tattoo removal device; an update on inventors who created surf-inspired fitness equipment.

A workout program that teaches people how to exercise in their heart rate zone; throwing dance parties for kids with a traveling disco van; a damage-proof cell phone case; an update on The Painted Pretzel.

Two entrepreneurs try to solve the "carmuter triangle"; an 18-year-old seeks an investment in her natural skincare line of sugar scrubs; shrink-wrap gift bags.

Gourmet meat business; a cooler with interior LED lighting; full-body spandex suit; an advance filter water bottle; follow up on a play and party space for kids from season four.

A fishing bobber made from a shotgun shell; homemade cupcakes in a jar; generating electricity through walking; a belt with no holes; a fitness-based dance program.

Frozen concentrated gumbo brick; a bird feeder that shocks squirrels; artisan coffee subscription business; wooden home and kitchen items; ECreamery update.

Teaching kids how to ride a bike that doesn't have pedals; a movie about motorcycle racing; a hot-pink food truck run by beautiful women; fun photo booths.

Two women pitch their military-inspired jewelry line; traditional British scone; custom furniture; door-to-door luggage pickup service; update on the Scrub Daddy cleaning tool.

An app that provides international travelers with access to live translators; all-natural dog treats; a dating website designed to attract quality singles; gourmet grilled cheese and tomato sandwiches; Dr. Heinz Doofenshmirtz ("Phineas and Ferb").

Savory cake balls; upgrading communication between patients and medical professionals; gourmet pickles; a mobile app for sending postcard.

Chic fashion accessories for dogs; a breathalyzer app; gourmet mango preserves; an update on the creator of spa-quality body scrubs.

Aromatherapy sprays to help kids afraid of the dark; a carrier for toddlers; protecting hair from cooking fumes; a cooking tray for ramen noodles.

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An entrepreneur accepts an unprecedented deal; a Halloween attraction; a product to help people communicate their feelings.

Safe and natural cleaning products; a party cup with a hidden shot glass; a lightweight, electric bodyboard; a root cover for recently planted trees.

Helping men with marriage proposals; a baby-bump sound system; a maker of bread puddings seeks an investment in her business; a safe fur color for dogs.

A product that identifies home visitors; sending imaginative toys to kids through a subscription gift service; a slaw/salsa condiment; a cell phone app.

Popular knee-high boot socks sold online; a stylish clutch for essential items; a way for kids to create and personalize lunchbox designs; customized chocolate bars; artisan cheese and glazed donut sandwiches.

Boneless baby back ribs that only take two minutes to cook in a microwave; detachable mohawks for kids' safety helmets; a reality interface for video gamers.

Solving a holiday headache with colorful, magnetic strands; an item to bridge the gap for interfaith families; a fun, new take on traditional Christmas sweaters; luxurious clip-in hair extensions.

Mobile fitness company for kids; a way for fixing holes in walls; a solution for photos stacking up on smartphones; webcam privacy shield; Nuts N More update.

A mask made of Alaskan glacial mud; powerstrips and surge protectors that blend in with hardwood floors; fanciful balloon designs; gourmet grilled cheese business update.

Stylish baby shoes; emergency food-replacement pill; children's swimwear with sun protection; custom playing cards for exercise; Daisy Cakes follow-up.

Guest judge Steve Tisch; one product has all the Sharks interested; gourmet edible cookie dough; organic flavored milk; an app that produces hands-free panoramic picture taking; interactive workout technology; Pro-NRG follow-up.

A juice and smoothie cart powered by a vintage bicycle; classes that teach people how to pick locks, escape from handcuffs and disappear; a high-energy, zero-impact fitness program based on yoga; a breakfast brand featuring Southern specialties.

A unique dating service; eco-friendly bamboo cleaning cloths; a fitted sheet and sleeping bag combo for making beds quickly; a buzzing medical device.

A bike lighting system; clothing with reinforced knees and built-in squeakers for crawling babies; a shoe buffing pad that attaches to a power drill; modular shoelaces.

Kids and teenagers present ideas that include a way to make drinking water more appealing, a business that tackles electronic waste and spicy-flavored raw honey; an update on Ryan's Barkery.

Energy bars that include protein from crickets; a garage lock to prevent break-ins; a shower cap that fixes "bedhead"; digital textbook rentals; an update on Fiber Fix.

A commerce flower business; anti-aging lifting strips; a breakaway hanger; tablewear made from renewable plant materials; a follow up of Groovebook.

Barbara and Lori team up against Robert, Mark and Kevin over an enticing product; whimsical plush slippers; dynamic signage; trousers and leggings that lift the butt; bold-flavored nuts.

A service that helps people find and hire music instructors; a way to stop accidental fire sprinkler activations; a battery charger made using fire and water; all-inclusive project kits; an update on a past investment.

Smart light bulb; high-tech cork replacement; subscription service for children's books; fort-building construction kits for kids; a follow-up on the Breathometer.

An 11-year-old who handcrafts bow ties; a hot beverage made from roasted cocoa beans; nutritional supplements; a 5K obstacle course race.

A commerce flower business; anti-aging lifting strips; a breakaway hanger; tablewear made from renewable plant materials; a follow up of Groovebook.

Lighter, healthier wine alternative; deep-sea treasure hunting business; collapsible kayak; decadent cinnamon rolls with a twist; an update on a lobster roll food truck business.

Reusable storage box; reinvented cookware; an iPad app that measures foot sizes; a solution to tying water balloons; follow-ups on past entrepreneurs.