20. Yes, Emilio Estevez Is In It (Mission: Impossible)
It'd be easy to forget this one, but yes, Emilio Estevez is in the first M:I movie, playing the team's tech geek Jack Harmon. Estevez went uncredited for the appearance, which only makes it easier to forget that he's in it at all, not that he lasts particularly long anyway. Coincidentally, the year after this role is where the actor's career began its downturn, with a ton of TV movies and "lesser" projects dominating his filmography. As such, it's a shame Jack didn't get to stick around longer, because he could've been one of Ethan Hunt's more amusing cohorts to return for sequels (and Estevez probably would've appreciated the payday).