- Script
- Chris Claremont (credited)
- Pencils
- Marc Silvestri (credited)
- Inks
- Hilary Barta (credited)
- Colors
- Glynis Oliver (credited)
- Letters
- Joe Rosen (credited)
- First Line of Dialogue or Text
- Jean Grey. Madelyne Pryor. Flip sides of the same coin,
- Genre
- superhero
- Characters
- Marauders: Blockbuster (villain, death); Malice [Alice MacAllister] (possesses Polaris); Polaris [Lorna Dane] (possessed by Malice); Sabretooth [Victor Creed] (villain)
X-Factor: Archangel [Warren Worthington III] (guest); Beast [Hank McCoy] (guest); Cyclops [Scott Summers] (guest, also in flashback); Iceman [Bobby Drake] (guest); Marvel Girl [Jean Grey] (guest)
X-Men: Colossus [Piotr Rasputin]; Dazzler [Alison Blaire]; Havok [Alex Summers]; Longshot (Mojoverse); Psylocke [Betsy Braddock]; Rogue [Anna Marie]; Storm [Ororo Munroe]; Wolverine [Logan]
Goblin Queen [Madelyne Pryor] (villain, corpse, flashback as Madelyne Pryor); Elaine Grey (guest); John Grey (guest); Juggernaut [Cain Marko]; Mister Sinister [Nathaniel Essex] (villain); Professor X [Charles Xavier]; Ship; Nathan Christopher Charles Summers (guest); Mariko Yashida (photograph)
- Universe
- Marvel : mainstream
- Synopsis
- The X-Men battle Mr. Sinister on the psychic plane. Maddie's mind merges with Jean Grey's and fights for dominance. The X-Men hunt Sinister and the Marauders to his base of operations, Xavier's School for Gifted Youngsters. The X-Men attempt to separate Malice and Polaris but Sinister teleports them out and knocks them unconscious with only Longshot standing in the way of his victory.
- Reprints
Continued from X-Factor (Marvel, 1986 series) #38; Concluded in X-Factor (Marvel, 1986 series) #39.