Louis C.K. provides the voice for the expressively named The Horrifying Sweaty One-Armed Monstrosity. ‘Gravity Falls’ boy band Sev’ral Timez had a real-life boy band cameo A recurring ...

Previous guest stars on Gravity Falls have included Nick Offerman as the voice of a secret agent and Neil deGrasse Tyson as the voice of a super-intelligent pet pig. Contact us at letters@time.com ...

both of which came to the attention of “Gravity Falls” voice actor Alex Hirsch. In response, Hirsch posted a video of a puppet Stan declaring that he will not stand for such hideous ...