- Script:
- Arnold Drake
- Pencils:
- Barry Windsor-Smith [as Barry Smith]
- Inks:
- Mike Esposito [as Michael Dee]
- Colors:
- ?
- Letters:
- Herb Cooper
- Genre:
- superhero
- Characters:
- The X-Men [Angel; Beast; Cyclops; Iceman; Marvel Girl]; Blastaar (villain)
- Reprints:
Barry Windsor-Smith's 1st U.S. artwork.
- Script:
- Arnold Drake
- Pencils:
- Werner Roth
- Inks:
- John Tartaglione
- Colors:
- ?
- Letters:
- Jean Simek
- Genre:
- Superhero
- Characters:
- Beast (origin conclusion); Hank McCoy (as teenager); GS: Professor X; X-Men [Cyclops; Iceman; Angel]; Norton McCoy; Edna McCoy; V: El Conquistador; Chico
- Reprints: show reprint note before migration
The Origins of the Uncanny X-Men! part 16, origin of the Beast conclusion, page 1 is not reprinted in the Amazing Adventures #17 and X-Men Mutations #nn reprints, next chronological appearance in X-Men #1.
- Letters:
- typeset
Includes a letter from Mark Gruenwald and Roy Thomas.