Adult Swim's Rick and Morty has proven to be a critical smash for the network, having amassed an impressive following over the course of its three seasons, however, the show's future appears to be in jeopardy.

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Co-creator of the series, Dan Harmon, took to Twitter yesterday to respond to a fan who'd demanded he return to focusing on the next season of Rick and Morty. However, as Harmon noted, Adult Swim hasn't actually picked up the critically-acclaimed series for a fourth season.

It's unknown just what is preventing the network from ordering a fourth season, however, Harmon is not the first involved with the series to address the show's looming renewal status. Back in January, Rick and Morty writer Ryan Ridley confirmed that they'd yet to set up a writers' room for any forthcoming season. Ridley also went on to say that Harmon, Roiland and Adult Swim need to "get their s— together."

Given that the series has done wonders for the network in ratings, with the last season pulling in the highest live+same day ratings in Adult Swim's history, it's more than likely that the show will return. However, like with the third season, there may be a bit of wait as Harmon and Roiland work to try and top past seasons.

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Rick and Morty, created by Justin Roiland and Dan Harmon, first premiered on Cartoon Network's Adult Swim programming block back in 2013 and has gone on to air three seasons since; of course, as fans will note, the third season had a long documented journey to the small screen. The show's most recent episode, "The Rickchurian Mortydate," aired in October of last year.