Based on _"Ant & Dec's Gameshow Marathon" (2005)_, a series that aired on ITV in 2005 to commemorate the network's 50th anniversary, "Gameshow Marathon" is a 7-episode game show tournament airing on CBS featuring game shows that have at some point or another been on the network. The game shows featured are "The Price is Right," "Let's Make A Deal," "Beat The Clock," "Press Your Luck," "Card ...