The comedy is set in the underbelly of a Los Angeles where puppets and humans co-exist. Two clashing detectives, one human (McCarthy) and one puppet, are forced to work together to figure out who is brutally murdering the former cast of The Happytime Gang, a beloved classic puppet show.
The film has been in production at the Jim Henson company since 2008.
Jim Henson, Melissa McCarthy, Jeffrey Hayes and Ben Falcone will serve as producers, while Lisa Henson, Dee Robertson and John W. Hyde will executive produce. McCarthy and Falcone will producer under their On the Day Productions banner.
The story is by Todd Berger & Dee Robertson; the screenplay is by Berger, Robertson, Erich & Jon Hoeber and McCarthy.