Fans, for example, seem convinced that Marvel and DC are locked in a contentious rivalry, despite statements from Marvel boss Kevin Feige and DC creative co-chair James Gunn to the contrary. Many fans have also assumed that Gunn’s appointment was somehow a slight to Zack Snyder, whose own take on the DC Universe ended in failure. That’s probably best depicted in its most recent episode, which features two ambitious cameos from the top of the DC food chain. In “Ricker Than Fiction,” Rick and Morty travel to the Warner Bros. studio lot to fix their favorite movie franchise. (“Probably,” Snyder hedges.)