Clark Gregg To Appear As Agent Coulson In Two Up Coming Marvel Films Clark Gregg is crossing paths with another Marvel superhero. A regular on CBS' sitcom "The New Adventures of Old Christine," Gregg will reprise his role from "Iron Man" as Agent Coulson in "Thor." The character is the latest to appear in multiple Marvel productions as the comicbook company's film division preps for the eventual production of "The Avengers," which unites Iron Man, the Incredible Hulk, Captain America and Thor in one pic. Marvel has been keen on brokering deals with actors to make sure auds will recognize characters when they crossover and appear in its other films. Gregg's Agent Coulson also will return in the upcoming "Iron Man 2." Thor," which Kenneth Branagh is helming now, stars Chris Hemsworth as the hammer-wielding Norse god, as well as Anthony Hopkins, Natalie Portman, Tom Hiddleston, Samuel L. Jackson, Stellen Skarsgard and Kat