1st appearance of Nimrod, an advanced sentinel from an alternate timeline
1st appearance of Firestar in mainstream continuity, previously appeared in the comic book adaptation of the animated series 'Spider-Man and His Amazing Friends'
James Proudstar appears in the classic Thunderbird costume
1st team appearance of Andrea and Andreas Strucker, the twin children of Baron Von Strucker that comprise the terrorist organization Fenris
Later the twins take on the identities of Swordsman (Thunderbolts) and Songbird