Ace Peterson is Mike Peterson's son. Ace was with his father when an explosion occurred at a nearby building. Mike promptly tells him to stay with a hotdog vender and goes into the building. After saving a doctor from inside Mike reaches Ace and leaves the area with him.

Centipede abducted Ace after they learned Mike had become an agent of S.H.I.E.L.D., and held him hostage in exchange for Agent Phil Coulson. Mike betrayed his fellow agents by telling them Centipede wanted him in exchange for Ace, and handed Coulson over to Centipede. At the last moment, Mike left Ace with the rest of his team and turned around to save Coulson, but was apparently killed in a fiery explosion.