Over a series of rounds, the two teams of two present Harry with fun stuff which Harry must adjudicate on and ultimately decide what's in and what's out of the Fun Capsule with the triumphant team winning bragging rights.

Along the way there will be sketches, studio items and special guests. And the occasional appearance of an alien.

Harry is joined by guests Kathy Burke, Lorraine Kelly, Ainsley Harriott and Joe Lycett.

Helping Harry this week are comedians Mel Giedroyc and Bridget Christie, and broadcasting legends Eamonn Holmes and Judith Chalmers.

Helping Harry fill his capsule with hilarious moments this time are actors Sally Lindsay and Philip Glenister, comedian Joe Lycett and TV and radio host Sara Cox.

Helping Harry Hill fill the fun capsule and prevent an alien invasion this time are comedians Ross Noble and David O'Doherty, Game of Thrones star Raleigh Ritchie and national treasure Gloria Hunniford.

Helping Harry fill his capsule with hilarious moments this time are Cold Feet star Fay Ripley, former EastEnders actor Nina Wadia, comedian Nish Kumar and showbiz legend Des O'Connor.

In this final episode Harry Hill shares some of the funniest moments that didn't make it into the previous episodes of the series. Expect previously unseen highlights from Kathy Burke, Joe Lycett and Josh Widdicombe as well as others.

Helping Harry Hill fill the fun capsule to prevent an alien invasion in this episode are comedian Micky Flanagan, political journalist Robert Peston, Coronation Street actor Sally Dynevor, and broadcasting legend Anneka Rice.

Helping Harry Hill fill the fun capsule tonight are comedian Tom Davis, Casualty actor Suzanne Packer, EastEnders star Kara Tointon and legendary newsreader Moira Stuart.

Helping Harry fill the fun capsule in this episode are comedian Johnny Vegas, singing legend Jimmy Osmond, Emmerdale star Samantha Giles and national treasure Sue Johnston.

Helping Harry in this episode are Rizzle Kicks singer Jordan Stephens, broadcaster Janet Street-Porter, star of The Last Leg Alex Brooker, and legendary actor Una Stubbs.

Helping Harry Hill fill the fun capsule are actor Gaynor Faye, Countryfile's Anita Rani, Professor Robert Winston and comedy legends Cannon and Ball.

Helping Harry Hill fill the fun capsule and prevent an alien invasion this week are TV chef Rosemary Shrager, Radio 2 DJ Liza Tarbuck, former Doctor Who star Peter Davison and X Factor star Louis Walsh.

Helping Harry Hill fill the fun capsule are EastEnders actor Charlie Brooks, Holby City star Chizzy Akudolu, comedian Lolly Adefope and Countdown legend Carol Vorderman.

In this 'Unseen' episode, Harry Hill reveals some of his favourite funny moments that didn't make it into the main series, featuring Johnny Vegas, Jimmy Osmond, Anneka Rice and Micky Flanagan among others.

This week's guests are Martine McCutcheon, Les Dennis, Alison Hammond and Tom Courtenay.

Georgia Taylor, Bill Roache, Konnie Huq and Kevin Whately join Harry Hill.

Krishnan Guru-Murthy, Stephanie Beacham, Pam Ferris and Tom Allen are the guests on this episode.

Harry Hill is joined by Pam St Clement, Chelsee Healey, Chris Packham and The Krankies.

Jennie Bond, Nick Helm, Angellica Bell and Patrick Mower must find clips, people and anything that is fun or funny enough to save the world.

Helping Harry Hill fill the fun capsule and prevent an alien invasion this week are Hollywood actor Warwick Davis, gardening expert Charlie Dimmock, TV presenter Kelly Brook and children's TV presenter Sarah Greene.

This time Josh Widdicombe, Amanda Barrie, Samantha Womack and Michael Buerk help Harry Hill save planet Earth from a potential alien invasion.