Clark Gregg can now cross two things off of his list: turning 50 and being featured on a character poster for Marvel's The Avengers. As Gregg celebrated his 50th birthday today, he marked the occasion by debuting a character poster featuring his own Agent Coulson alongside Samuel L. Jackson's Nick Fury. The S.H.I.E.L.D. agents will feature pretty heavily in the upcoming superhero mash-up.

Steve was able to land an interview with Gregg on a recent set visit, which you can read here.  We've also got interviews with director Joss Whedon, Marvel Studios president Kevin Feige and stars Mark Ruffalo, Tom Hiddleston, Jeremy Renner and Scarlett Johansson, Chris Hemsworth, and Robert Downey Jr. and Chris Evans. Get caught up with all of our previous coverage on The Avengers here before the film opens on May 4th. Hit the jump to check out the new character poster.

Gregg debuted this new poster via his Twitter acct, so you should wish him a happy birthday!

Clark Gregg ‏ @clarkgregg

Some of you voiced a desire to see the Son of Coul in posters for @Marvel@Avengers.To u I say thanks...and BOO-YA! http://yfrog.com/nylympj

Check out the poster after the official synopsis for The Avengers:

Marvel Studios presents in association with Paramount Pictures “Marvel’s The Avengers”–the Super Hero team up of a lifetime, featuring iconic Marvel Super Heroes Iron Man, The Incredible Hulk, Thor, Captain America, Hawkeye and Black Widow. When an unexpected enemy emerges that threatens global safety and security, Nick Fury, Director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. Spanning the globe, a daring recruitment effort begins. Starring Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner and Samuel L. Jackson, and directed by Joss Whedon, “Marvel’s The Avengers” is based on the ever-popular Marvel comic book series “The Avengers,” first published in 1963 and a comics institution ever since. Prepare yourself for an exciting event movie, packed with action and spectacular special effects, when “Marvel’s The Avengers” assemble in summer 2012. In “Marvel’s The Avengers,” superheroes team up to pull the world back from the brink of disaster when an unexpected enemy threatens global security.