The series, an adaptation of a Norwegian comedy, stars Jonah Hill and Emma Stone as patients in a mental institution where Hill’s character has constructed a fabulous fantasy world for himself. Theroux will guest-star on the comedy; details on his character are being kept under wraps right now.
The 10-episode project from Paramount TV and Anonymous Content got a straight-to-series order in May and started production in August. Cary Fukunaga (True Detective) will direct all 10 episodes and will executive-produce, along with Stone and Hill.
Theroux wrapped his three-season run as The Leftovers‘ Kevin Garvey in June. His other TV gigs include Parks and Recreation, Six Feet Under, The District and Alias.
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Though Maniac will be Theroux’s first time in front of the TV cameras since the Leftovers finale, it’s not his only upcoming small screen project: He and Jimmy Kimmel are teaming up to produce an ABC special in which today’s stars will give live performances of classic sitcom scripts of the 1970s, ’80s and ’90s.