Captain America [Steve Rogers]; Thor; Dum Dum Dugan; S.H.I.E.L.D.; Sensational Hydra [a Skrull; also as Captain America] (villain); Hydra (villains); Iron Man [Tony Stark] (cameo); Scarlet Witch (cameo); Gordon Winchester (cameo); Roger Ramo (cameo); Bob McKnight (cameo); Sue Harvey (cameo)
When Cap and the Avengers begin to take out Hydra cells, the Sensational Hydra takes hostages and calls Cap out. Captain America battles Hydra agents, some of whom turn out to be Skrulls, and is captured. The Sensational Hydra shape shifts into a duplicate of Cap and heads out to mess up his life.