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Fox is playing the turtles’ friend April O’Neil. Inhabiting the mo-cap shells are up-and-comers Alan Ritchson, Pete Ploszek, Jeremy Howard and Noel Fisher.

Arnett’s role is being kept secret, though still uncast from the Ninja Turtles mythology are Splinter, the turtles' sensei rat, and the villainous and masked Shredder. Arnett is not playing the turtles' human friend Casey, another role that has yet to be cast.

Producing the movie are Bay and his Platinum Dune partners Andrew Form and Brad Fuller, along with Jason Reed, Galen Walker and Scott Mednick.

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The script is by Josh Appelbaum and Andre Nemec (Mission: Impossible -- Ghost Protocol).

Paramount has set a June 6, 2014, release for Ninja Turtles.

Arnett is returning to his Emmy-nominated role as Gob in Netflix’s Arrested Development and also is starring in a CBS pilot for Greg Garcia.

On the animated front, Arnett is voicing Batman in Warner Bros.’ upcoming The Lego Movie and the lead character of Surly in The Nut Job from Gulfstream Pictures.

He is repped by WME, Principato Young and Stone Meyer.