Signatures obscured by UPC box on cover, but visible in reprint in collected edition.
Amalgam characters: Judgment League Avengers: Justice League of America and the Avengers;
Angelhawk: Angel and Hawkman; Hawkeye: Hawkeye and Green Arrow; Captain Marvel: Captain Marvel (Mar-Vell) and Captain Marvel [Billy Batson]; Super-Soldier: Captain America and Superman; Dark Claw: Batman and Wolverine; Goliath: Green Arrow and Hawkeye; Canary: Black Canary and Mockingbird;
JLX: Justice League of America and the X-Men;
Firebird: Fire and Phoenix; Apollo: Cyclops and Ray [Ray Terrill]; Mercury: Impulse and Quicksilver; Mariner: Aquaman and Sub-Mariner; Runaway: Gypsy and Rogue; Wraith: Obidian and Gambit; Night-Creeper: Nightcrawler and the Creeper; Mr. X: Martian Manhunter, Professor X, the Skrulls and Bishop;
Will Magnus: Will Magnus and Bolivar Trask; Sentinels: Sentinels and Manhunter robots; Jocasta: Jocasta, Platinum (of the Metal Men) and a Sentinel