The story arc introduced the supervillain team the Squadron Sinister, whose four members were loosely based on heroes in DC Comics' Justice League of America, with Doctor Spectrum based on Green Lantern.
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There have been five versions of the character to date - three supervillains from the mainstream Marvel Universe belonging to the team Squadron Sinister (Earth-616) and two heroes from different alternate universes.
The Sabre Squadron | No. 33 Squadron RAF | No. 263 Squadron RAF | Dexter and sinister | squadron | Pacific Squadron | No. 45 Squadron RAF | No. 127 Squadron RAF | No. 617 Squadron RAF | No. 43 Squadron RAF | No. 38 Squadron RAF | No. 107 Squadron RAF | German East Asia Squadron | Far East Squadron | Squadron (aviation) | No. 77 Squadron RAAF | No. 71 Squadron RAF | No. 49 Squadron RAF | No. 48 Squadron RAF | No. 2 Squadron RAF | No. 233 Squadron RAF | No. 133 Squadron RAF | Mister Sinister | Asiatic Squadron | 44th Fighter Squadron | 24th Tactical Air Support Squadron | 160th Fighter Squadron | Volunteer Gliding Squadron | Squadron Sinister | No. 65 Squadron RAF |