iTunes in the Cloud is part of iCloud, and lets you re-download or stream your previously purchased TV shows -- and music, movies, iBooks, and apps -- from your iPhone, iPod touch, iPad, Apple TV, or Windows or Mac PC. If you switch devices regularly, or don't want to take up space storing TV shows you watch infrequently, iTunes in the Cloud lets you keep everything you want to watch close by, and watch it whenever you want, wherever you want. You just have to make sure you're logged into your iTunes account, and you're good to go.
Here's how to access iTunes in the Cloud TV shows from your device.