Rick and Morty' exec producer Scott Marder shared how James Gunn and Zack Snyder agreed to parody themselves and their dueling 'Superman' takes.

Zack Snyder gives James Gunn some unsolicited advice about his 'Superman' movie as the two cameo on 'Rick and Morty': 'He's the Man of Steel, not the Man of Conversation.'

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,