Sylvester Stallone is set to guest star on the second season of This Is Us. Stallone will guest as Kevin’s co-star in the movie he’s filming at the start of the season. At the end of last season Kevin played by Justin Hartley got a big acting job in a film directed by Ron Howard. Executive Producer Dan Fogelman announced the news at the TCA press tour Thursday. “We have a great script of him. I think it’s going to be really, really excitin,” Fogelman said.