Contestants use lifelines to answer trivia questions for cash prizes; host Chris Harrison.

In celebration of the 20th anniversary of "Who Wants to Be a Millionaire," which debuted in the U.S. as a prime-time series in January 2000, late-night fixture Jimmy Kimmel steps into prime time as host of a special run of episodes featuring celebrity contestants playing for charity. For the first time in the history of the U.S. franchise, contestants can invite a guest into the hot seat to help them answer questions: it can be a relative, a beloved teacher or a famed trivia expert -- anyone they want -- to help them win as much money as they can for the charity of their choosing.

A contestant must choose from 26 sealed briefcases containing a marker for various amounts of cash from one penny to $1 million. The player then eliminates the remaining 25 cases one by one. The chosen ones are opened and the amount of money inside revealed. After several cases are opened, the player is tempted by the Banker to accept an offer of cash in exchange for not continuing the game and possibly winning a larger sum of money.

In this offbeat game show, players picked up in the Cash Cab have to answer trivia questions with mounting cash values before they reach their destination in order to win. If a player answers incorrectly three times, he is kicked out of the cab without any money. Help options include a Mobile Shout-Out (phone call) and Street Shout-Out (asking a stranger on the street). Once the player reaches his destination, he can leave the cab with his winnings, if any, or risk them on a more difficult question. A correct final answer doubles his winnings; an incorrect answer means he leaves the cab with no money at all. Comic Ben Bailey takes the cab's wheel as host.

Comic, actor, author and Emmy Award-winning talk-show host Steve Harvey pits celebrities against each other in a prime-time version of one of TV's most popular and enduring game shows, "Family Feud." Fan-favorite celebrities and members of their families compete against other stars and their relatives to win money for charity as they try to come up with the most popular responses to survey-style questions that were posed to 100 people. The lively competition is filmed in front of an audience in Los Angeles, Calif.