Will Arnett has been tapped as one of the stars of Ninja Turtles, joining Megan Fox in the CGI-slash-live-action project from director Jonathan Liebesman (Wrath of the Titans, Battle Los Angeles) and producer Michael Bay. “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,” writes THR. And no, Arnett isn’t playing Casey.