Gunn opted to kick off the franchise reboot by writing and directing Superman, which stars David Corenswet as the Man of Steel, Rachel Brosnahan as Lois Lane, and Nicholas Hoult as Lex Luthor. The film hits theaters Friday. "He's the Man of Steel, not the Man of Conversation," Snyder tells Gunn on the animated series.

Joining a long list of celebrity voices to have appeared on Rick and Morty, Snyder popped up to play himself. But the main guest star in “Ricker Than Fiction” is James Gunn —whose Superman hits theaters later this week,

James Gunn, writer and director of the off-kilter "Guardians of the Galaxy" films, tussled with various ideas on how to deliver a new take on Superman to the big screen.