Sense8 (2015-2018)

The Wachowskis' globally-filmed sci-fi drama about eight psychically linked strangers was cancelled after two seasons due to its enormous production budget of $9 million per episode, making it one of the most expensive shows ever produced at the time. Fan outcry was loud enough to secure a two-and-a-half-hour finale special, but the truncated ending still feels inadequate. Unlike Deadwood's three-season run, Sense8 barely got half that, leaving its complex mythology unresolved. The passionate viewer petition finally garnered over 500,000 signatures, a testament to its devoted following.