Catch 21 is an American game show broadcast by Game Show Network (GSN). Created by Merrill Heatter (who also produced the show's predecessor Gambit), the series follows three contestants as they play a card game centered on blackjack and trivia. The show is based on a popular online game from GSN's website and aired for four seasons from 2008 to 2011. It was hosted by Alfonso Ribeiro, with actress Mikki Padilla serving as the card dealer.