Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
Fact-based account of a group of gifted university students who develop a system for card-counting and use it to win big at Las Vegas casinos.
There are no TV Airings of 21 in the next 14 days.
Add 21 to your Watchlist to find out when it's coming back.
Check if it is available to stream online via "Where to Watch".