The film titled "Teen Titans GO! to the Movies," is based on the Cartoon Network series of the same name that follows a group of DC superheros and their whacky adventures.
Arnett and Bell join the film alongside the voice cast from the show including Greg Cipes as Beast Boy, Scott Menville as Robin, Khary Payton as Cyborg, Tara Strong as Raven, and Hynden Walch as Starfire.
Arnett and Bell's roles have yet to be announced.
"Teen Titans GO! to the Movies" will be directed by Aaron Horvath and Peter Rida Michail, from a screenplay by Michael Jelenic and Horvath.
Arnett is producing the project along with Michail and Peggy Regan. Sam Register, Jelenic, and Horvath as executive producers making Arnett the only producer who has not worked on the animated series, Variety reported.
Arnett and Bell's involvement was first unveiled Monday on Twitter as DC released a short teaser video for the film that lists off the voice cast.
Teen Titans heroes Robin, Starfire, Raven, Beastboy and Cyborg are seen sitting on the Hollywood sign in the clip.
Copyright 2017 United Press International, Inc. (UPI). Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.