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.'

But you don’t get more mainstream than Superman. And let’s face it, unless Christopher Reeve is in the suit, the rock-jawed Man of Steel can be a bit of a bore. Much of the fun and frustration of Gunn’s movie is seeing how he stretches and strains to make Superman, you know, interesting.