The Simpsons boss says Marvel was very supportive with Loki crossover, but the use of Stan Lee was forbidden

Variety

Al Jean says his Simpsons team received full cooperation from Marvel in making the short The Good, The Bart, and the Loki. "They really were great and supportive," says Jean. "The only note we had was we thought we could have a cameo by Stan Lee. We’re putting as many cameos and post-credits sequences into a four minute short as possible. But they said that their policy is that since he passed, they don’t use him in movies anymore, which I understood completely. And we had him on the show three times, so we had our shot." Will The Simpsons revisit the world of Marvel and Star Wars again? "We definitely want to keep doing these shorts — definitely (with) those two, but also with the other properties, like Pixar and the classic Disney movies," says Jean. "We’ll probably take a little more time on the next one. We haven’t settled on what we’re going to do yet, but there are just so many things that are just so, you know — I mean, as a kid, I was a huge fan of Marvel. I started collecting when I was six. These are the things that we would want to crossover or parody, anyways." ALSO: The Simpsons-Loki crossover featured more than 100 Marvel references in four minutes.