Marvel
Collects Giant-Size X-Men (1975) #1, Uncanny X-Men (1963) #94-110, Marvel Team-Up (1972) #53, 69-70, Annual (1976) #1, Iron Fist (1975) #14-15 and material from FOOM (1973) #10.
Second Genesis
Writers: Chris Claremont, Len Wein, Bill Mantlo
Artists: Dave Cockrum, John Byrne, Sal Buscema, Bob Brown, Tony DeZuniga