Captain America [Steve Rogers]; Red Skull (in photograph); Trapster (in photograph); Exiles (in photograph); Bucky Barnes (in photograph); Bucky Barnes (robot); Hood [Baron Wolfgang von Strucker robot]
Baron Strucker finds an amnesiac young man in the gyms of San Francisco and hypnotizes him into thinking he is Bucky. Strucker uses "Bucky" to lure Captain America into a trap. Cap and "Bucky" battle and defeat Strucker.
Captain America [Steve Rogers]; Bucky Barnes Robot (origin, dies); SHIELD [Sharon Carter; Nick Fury; Dum Dum Dugan; Jasper Sitwell (cameo)]; Falcon [Sam Wilson]; Redwing; Modok (villain); AIM (villains); Dr. Doom (flashback, villain); Batroc (cameo flashback, villain); Porcupine (cameo flashback, villain); Whirlwind (cameo flashback, villain); Baron Strucker Robot (cameo, villain); Walter Cronkite (cameo); Professor Paul Fosgrave (cameo flashback); Grizzly [Agent R-1] (cameo flashback, villain); Agent R-2 (cameo flashback, villain); Mart Baker (cameo flashback)
Captain America and the public at large believe Bucky Barnes has returned. It is revealed that Modok had Dr. Doom create a robot duplicate of Bucky. Modok makes Bucky attack Captain America. But the robot is unable to kill Cap leading Modok to destroy it.
Captain America [Steve Rogers]; Falcon [Sam Wilson] (joins as Cap's partner); Redwing; AIM (villains); Modok (origin, villain); AIM Scientist Supreme (introduction, villain); Bulldozer (introduction, villain); Iron Man [Tony Stark]
Modok's origin is revealed as a former AIM scientist who was turned against his will into the grotesque living computer. Modok creates the Bulldozer robot and sends it to Harlem to tear down the slums in order to gain the residents' favor while discrediting Captain America. Cap and the Falcon defeat the Bulldozer and Modok. After the battle, Cap takes on the Falcon as his partner.