- Script
- Steve Englehart
- Pencils
- Jim Starlin (credited as Starling)
- Inks
- Mike Esposito
- Colors
- ?
- Letters
- Denise Wohl
- Genre
- superhero
- Characters
- Beast (furry version); X-Men [Cyclops; Marvel Girl; Angel; Beast; Iceman]; Magneto
- Reprints
Single unified story composed out of edited versions of the back-up stories in X-Men (Marvel, 1963 series) #49-53 with a new page at the beginning and end. This sequence is for the new framing pages (p. 1 and p. 20). Last Beast appearance in Amazing Adventures. Beast's next appearance in Incredible Hulk #161. Jim Starlin's name is misspelled as "Starling" in credits.
- Script
- Arnold Drake
- Pencils
- Werner Roth
- Inks
- John Verpoorten
- Colors
- ?
- Letters
- Irv Watanabe
- Editing
- Stan Lee (original editor)
- First Line of Dialogue or Text
- A Beast Is Born
- Genre
- superhero
- Characters
- The Beast (origin); Hank McCoy (as baby); Norton McCoy; Edna Andrews McCoy (Beast's parents); Bob (Norton McCoy's uncle)(introduction); Paul Martin (introduction)
- Reprints
The Origins of the Uncanny X-Men! part 12, origin of the Beast part 1, page 1 of the original story is not reprinted.
- Script
- Arnold Drake
- Pencils
- Werner Roth
- Inks
- John Verpoorten
- Colors
- ?
- Letters
- Herb Cooper
- Editing
- Stan Lee (Original Editor)
- Genre
- superhero
- Characters
- Hank McCoy [Beast] (as young child, teenager, and adult, origin continued); Edna McCoy; Uncle Bob; El Conquistador (name revealed in next issue) (introduction); Chico (name revealed in next issue, introduction)
- Reprints
The Origins of the Uncanny X-Men! part 13, origin of the Beast part 2, page 1 of the original story is not reprinted.
- Script
- Arnold Drake
- Pencils
- Werner Roth
- Inks
- John Tartaglione
- Colors
- ?
- Letters
- Herb Cooper
- Editing
- Stan Lee (Original Editor)
- Genre
- superhero
- Characters
- Beast (origin continued); Hank McCoy (as teenager); Professor X; X-Men [Cyclops; Iceman; Angel]; El Conquistador
- Reprints
The Origins of the Uncanny X-Men! part 14, origin of the Beast part 3, pages 1 and 2 of the original story are not reprinted.
- Script
- Arnold Drake
- Pencils
- Werner Roth
- Inks
- John Verpoorten
- Colors
- ?
- Letters
- Sam Rosen
- Editing
- Stan Lee (Original Editor)
- Genre
- superhero
- Characters
- Beast (origin continued); Hank McCoy (as teenager); Professor X; X-Men [Cyclops; Iceman; Angel]; Norton McCoy; Edna McCoy; El Conquistador
- Reprints
The Origins of the Uncanny X-Men! part 15, origin of the Beast part 4, pages 1 and 2 of the original story are not reprinted.
- Script
- Arnold Drake
- Pencils
- Werner Roth
- Inks
- John Tartaglione
- Colors
- ?
- Letters
- Jean Simek
- Editing
- Stan Lee (original editor)
- Genre
- superhero
- Characters
- Beast (origin conclusion); Hank McCoy (as teenager); Professor X; X-Men [Cyclops; Iceman; Angel]; Norton McCoy; Edna McCoy; El Conquistador; Chico
- Reprints
The Origins of the Uncanny X-Men! part 16, origin of the Beast conclusion, page 1 of the original story is not reprinted.