| Issue | #21 |
| Published | May 1988 |
| Cover Price | 1.00 USD; 1.25 CAD |
| Pages | 36 |
| Editing | Ann Nocenti; Terry Kavanagh (assistant editor); Roger Stern (original material) |
| Genre | Superhero |
| Pencils | Arthur Adams |
| Inks | Terry Austin |
| Genre | Superhero |
| Pencils | Arthur Adams |
| Inks | Terry Austin |
| Characters | FEATURE: X-Men--Cyclops; Storm; Wolverine; Colossus; Banshee; Nightcrawler; GUESTS: Ka-Zar; Zabu; Nereel; Fall People; VILLAINS: Sauron; Zaladane; Garokk; CAMEO FLASHBACK: Iceman; Marvel Girl [Jean Grey]; Beast |
| Synopsis | The X-Men fight Sauron until he transforms back to Karl Lykos; Ka-Zar shows up and he and Karl tell the X-Men the tale of Zaladane awakening Garokk; Cyclops decides to leave the Savage Land rather than help as he fears for Xavier's safety; The way back to the surface world is blocked by ice as the Savage Land begins to undergo a terrible change. |
| Genre | Superhero |
| Script | Chris Claremont; John Byrne (co-plotter) |
| Pencils | John Byrne (p. 1-10, 14-20); Kieron Dwyer (p. 11-13) |
| Inks | Terry Austin |
| Colors | Petra Scotese |
| Letters | Rick Parker (p. 1-10, 14-20); Tom Orzechowski (p. 11-13) |
| Reprinted | from X-Men (Marvel, 1963 series) #115 |
| Characters | Colossus |
| Genre | Superhero |
| Script | Chris Claremont |
| Pencils | John Bolton |
| Inks | John Bolton |
| Colors | Glynis Oliver |
| Letters | Tom Orzechowski |
| Reprinted | in Star Magazine (Edizioni Star Comics, 1990 series) #22; in X-Men: Lost Tales (Marvel, 1997 series) #2 |
| Characters | Professor X; Cyclops; Phoenix [Jean Grey]; Storm; Wolverine; Colossus; Banshee; Nightcrawler; Beast; Sauron |
| Genre | Superhero |
| Pencils | John Byrne |
| Inks | Terry Austin |
| Letters | Dan Crespi; Michael Higgins |
| Reprinted | from X-Men (Marvel, 1963 series) #114; from X-Men (Marvel, 1963 series) #115 |
| Characters | Colossus |
| Genre | Superhero |
| Pencils | John Bolton |
| Inks | John Bolton |
| Notes | Back Cover |
| Reprinted | in X-Men: Lost Tales (Marvel, 1997 series) #2 |