Mister Sinister
Nathaniel Essex
Created by Chris Claremont & Marc Silvestri
First Appearance
The Uncanny X-Men #221 (1987)
Appearances
312
Primary Team
Hellfire Club
Debut Era
1980s
A Victorian geneticist transformed by Apocalypse into an immortal mutant obsessed with the Summers bloodline. Sinister is the architect of some of the X-Men's greatest tragedies — the Mutant Massacre, the creation of Madelyne Pryor, the cloning of Jean Grey. He is charming, theatrical, and utterly amoral, a scientist who treats people as specimens. On Krakoa, he sat on the Quiet Council while secretly cataloguing every mutant genome for his own designs.
Appearances Over Time
Series
Most Appearances By Series
Immortal X-Men (2022) 18 issues
Hellions (2020) 17 issues
The Uncanny X-Men (1981) 16 issues
Uncanny X-Men (2012) 14 issues
Gambit (1999) 11 issues
Weapon X (2002) 10 issues
X-Factor (1986) 10 issues
X-Men (1991) 10 issues
X-Man (1995) 10 issues
X-Men (2004) 9 issues
Events
Event Participation
First Appearance
The Uncanny X-Men #221
1987
First Appearance
The Uncanny X-Men #221
September 1987