Superheroes Sinister

When the story from Defenders #13 (May 1974) later ran in Rampage #12 (Jan. 4, 1976), the U.K. reprint series kept the cover illustration of the original. But whereas the original cover text promoted Super-Team vs. Super-Team, the reprint said, "Superheroes battle Superheroes when--the Squadron Sinister Strikes!

As their name implied, of course, the Squadron Sinister were not superheroes. To be fair, though, the Squadron Sinister did look strikingly like their superheroic counterparts in the Squadron Supreme—so much so that the cover of Avengers #141 (Nov. 1975) had incorrectly billed the Squadron Supreme as the Squadron Sinister!