Iron Fist, described by Rolling Stone as "the first misfire from the Netflix galaxy of the Marvel universe," is far from the best-known Marvel hero, so as you can imagine his video game appearances have been as scarce as his appearances as other media. He first appeared during Marvel's brief mid-Seventies infatuation with martial artists (remember Shang-Chi, Master of Kung Fu? No?) appearing in Marvel Premiere #15 in May 1974. Created by writer Roy Thomas (best-known for penning The Avengers, Ghost Rider, The Defenders) and artist Gil Kane (known for his work on Green Lantern, Spider-Man), the martial artist and his mystical powers didn't start showing up in TV shows until 2009 when he appeared in an episode of the goofy kid-focused Super Hero Squad followed by an episode of The Avengers: Earth's Mightiest Heroes in 2012. He also popped-up as a teenager in Disney XD's polarizing Ultimate Spider-Man as well as the Lego Marvel Super Heroes: Maximum Overload mini-series a year later.
When it comes to video games, he's actually shown his face more times than you probably think – although he's never been especially high-profile, and has usually been relegated to the role of a support character. Where you're most likely to have noticed him was in Vicarious Visions' popular 2009 button-mashing action RPG Marvel Ultimate Alliance 2, which borrowed heavily from both the Marvel Secret War and Civil War storylines. He was playable as a member of the Anti-Registration side in the PS3, Xbox 360, PS4, Xbox One and PC versions of the game, and you can see him teamed up with Captain America in the video above. Most recently you may have seen him in Lego Marvel's Avengers, in the Marvel re-skinned version of Puzzle Quest, Netmarble's mobile game Marvel: Future Fight or Kabam's phenomenally popular Marvel Contest of Champions.
The first game he ever appeared in though was the 1994 Super NES and Genesis brawler Spider-Man and Venom: Maximum Carnage. Though he wasn't actually a playable character, when you played the game as Spider-Man, Iron Fist would heal you back to full health, and when you played as Venom, Iron Fist would attack all of the enemies on screen with a flying jump kick and splashy "thwack" caption.