| Issue | #134 |
| Published | June 1980 |
| Cover Price | 0.40 USD |
| Pages | 36 |
| Editing | Jim Salicrup |
| Notes | Letters page replies by Chris Claremont. |
| Characters | Cyclops; Phoenix; Wolverine; Colossus; Sebastian Shaw; Harry Leland; Mastermind |
| Genre | superhero |
| Pencils | John Byrne (signed) |
| Inks | Terry Austin (signed) |
| Letters | Gaspar Saladino; typeset |
| Notes | Letters page replies by Chris Claremont. |
| Reprinted | in Essential X-Men (Marvel, 1996 series) #2; in X-Men: Dark Phoenix Saga (Marvel, 2010 series) #[nn] |
| Characters | FEATURE: X-Men--Cyclops; Phoenix [Jean Grey; also as Dark Phoenix on last page]; Storm; Wolverine; Colossus; Nightcrawler; GUESTS: Beast; VILLAINS: Hellfire Club--Sebastian Shaw; Harry Leland; Donald Pierce; Mastermind; Hellfire Soldiers; CAMEO: Senator Robert Kelly |
| Synopsis | Jean breaks Mastermind's spell over her and the X-Men battle the Hellfire Club through the Club's mansion; Jean drives Mastermind insane for toying with her mind; Jean snaps and becomes Dark Phoenix. |
| Genre | superhero |
| Script | John Byrne (Co-plot); Chris Claremont |
| Pencils | John Byrne |
| Inks | Terry Austin |
| Colors | Bob Sharen |
| Letters | Tom Orzechowski |
| Reprinted | in Uncanny X-Men, The (Marvel, 1984 series) #nn; in Classic X-Men (Marvel, 1986 series) #40 (Mid-November 1989); in X-Men: The Dark Phoenix Saga (Marvel, 1991 series) #nn; in Essential X-Men (Marvel, 1996 series) #2 (1997); in Uomo Ragno, L' (Edizioni Star Comics, 1987 series) #15; in X-Men: Dark Phoenix Saga (Marvel, 2010 series) #[nn] |