Most frustrating TV shows canceled on a cliffhanger 3 As the fall TV season starts up, shows are resolving their agonizing summer cliffhangers — but for some unlucky shows, that resolution never arrived. Here are the most frustrating "cancel-hangers," cliffhanger endings for shows that got cancelled too soon. Advertisement First of all, let me apologize for giving away spoilers for last week's Warehouse 13 in my post on best cliffhangers — I should have realized that many people wouldn't have had time to see the episode yet, and I should have been more careful. Sorry about that — I'll be more careful next time. That said...