in The Official Marvel Index to the X-Men (Marvel, 1987 series) #3 (September 1987)
in Marvel Comics Presents The X-Men (Marvel, 1988 series) #[nn] (1988) [cover]
in Marvel Special (Marvel Italia, 1994 series) #14 (Luglio 1998)
in Marvel Visionaries: Jim Steranko (Marvel, 2002 series) #[nn] ([September] 2002)
in Marvel Masterworks: The X-Men (Marvel, 2003 series) #5 ([August] 2005), #5 ([August] 2005) [cover]
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)Sources for colors credit are The Marvel Comics Index (Olshevsky 1981), The Official Marvel Index to the X-Men (Olshevsky 1987), and The Official Marvel Index to the X-Men (Ward 1994).
in Marvel Special (Marvel Italia, 1994 series) #16 (Marzo 1999)
in Marvel Masterworks: The X-Men (Marvel, 2003 series) #5 ([August] 2005)
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)X-Men rejoined as a team
Sources for particularization of Heck pencils credit are The Official Marvel Index to the X-Men (Olshevsky 1987), The Official Marvel Index to the X-Men (Ward 1994), and Official Index to the Marvel Universe (Vandal et al. 2009).
in Amazing Adventures (Marvel, 1970 series) #17 (March 1973) [pages 2-5]
in X-Men: Mutations (Marvel, 1996 series) #[nn] (1996) [pages 2-5]
in Marvel Special (Marvel Italia, 1994 series) #12 (Novembre 1997) [abridged]
in Marvel Masterworks: The X-Men (Marvel, 2003 series) #5 ([August] 2005)
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)
in Essential Classic X-Men (Marvel, 2006 series) #2 (2006) [black & white]The Origins of the Uncanny X-Men! part 12, origin of the Beast part 1, page 1 of this story is not reprinted in the Amazing Adventures #17 and X-Men: Mutations #nn reprints.
in The X-Men Omnibus (Marvel, 2009 series) #2 ([April] 2011)