Today Ellen welcomes TV's most legendary game show architect, Merv Griffin, for a chat about his incredible career. Later, ""That 70's Show"" star Topher Grace drops by to discuss his newest film, ""Win A Date with Tad Hamilton.""

The busiest man in Hollywood and the glue that holds together the biggest show on television, "American Idol" host RYAN SEACREST visits with Ellen. Ryan chats about the final five contestants and clears up rumors of any ongoing feuds. Legendary actor, producer and talk show host, MERV GRIFFIN, stops by to chat about his DVD "The Merv Griffin Show: 40 of the Most Interesting People of Our Time." And, Ellen meets up with three KID INVENTORS who show off their latest creations. Plus, Ellen checks in with the 84-year-old great grandmother who won the $10 million jackpot on a nickel slot machine.