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Leech puts out a field that suppresses and negates the superhuman powers of those around him.
The green-skinned Leech was orphaned as a toddler. His parents left him to die when his mutations became apparent. He was found by the Morlock Caliban and taken to a woman named Annalee who raised him and several other young mutant orphans as her children. During his life in the Morlock tunnels, he made friends with a mutant his age named Artie Maddicks and had a few brief encounters with the X-Men.
During the "Mutant Massacre," Mister Sinister rallied his henchmen, the Marauders, to infiltrate the sewers and massacre all the Morlocks living there in an effort to rid the world of "genetically impure" mutants. While many Morlocks were killed, Leech, Artie and Caliban survived, rescued by the Power Pack and the X-Terminators (the X-Factor in their mutant roles). Leech and Artie were placed in the care of X-Factor until they could be enrolled in private school.
Soon after they began attending this school, Leech and Artie were captured by mutant-hunting demons. They were again rescued by X-Factor, this time with the help of the New Mutants. The two went back to attending school for several months before they were kidnapped a third time, this time by Gene Nation.
This group, composed of second-generation Morlocks were the descendants of those who survived the massacre in the tunnels. They were born and raised in an alternate dimension with a faster flow of time than this one called The Hill. They sought revenge for those who wronged their for-bearers. The Gene Nation led a campaign to hunt down and kill as many humans as possible, since it was the humans' unwillingness to accept them that led their parents to the tunnels in which they were massacred. Leech and Artie wanted no part of this, but were trapped until they were rescued by Generation X. They were thereafter made junior members and remained with the team until it disbanded.
Leech and Artie continued to live in the Massachusetts Academy under the care of Emma Frost. When they met Franklin Richards, they were inducted into his own short-lived team, the Daydreamers. When Richards' family, who had previously been exiled to an alternate universe, returned, the group was disbanded. Leech and Artie returned to the academy to take on more active roles.
For a time, the academy was shut down and, although it is never made clear, Leech may have transferred to another school. What is known is that he was eventually captured by the revived Weapon X program and forced into a machine that was designed to attached to a mutant, take their powers, and then project them to any other mutant in the world. Sabretooth, then a part of Weapon X, used the machine, at one point, to strip Wolverine of his healing abilities in order to finish him once and for all.
Leech survived, but continued to be used by the Weapon X program to keep imprisoned mutants under control.
After the events of "M-Day", Leech reappeared unharmed from Neverland on the grounds of the Xavier Institute. He is one of the estimated 198 mutants who have retained their powers.
First Appearance: Uncanny X-Men (1963) #179
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View a chronological listing of this character's appearances
All-New Official Handbook of the Marvel Universe A to Z (2006)
#7 Amazing X-Men (1996)
- 'Victor Mancha to Phantazia'
Avengers Academy (2010)
Avenging Spider-Man (2012)
Civil War: X-Men (2006)
#1 Dark Avengers/Uncanny X-Men: Utopia (2009)
- 'Part One'#4
- 'Part Four'
#1 Deadpool V Gambit (2016)
- 'Once Upon a Time...'#2
- 'Across the Universe'#3
- 'Dark Eyes'
Fantastic Four (1961)
#574 Fantastic Four (2013)
- 'Days of Future Franklin!'#579
- 'The Future Foundation'#580
- 'The Frank-tastic Four'#583
- 'In Latveria, the Flowers Bloom in Winter'#584
- 'Congratulations, Mister Grimm. You're Handsome Again!'#585
- 'The Kings of Atlantis!'#586
- 'The Last Stand!'#588
- 'Epilogue: Month of Mourning/Uncles'#600#604
- 'Forever, Part 5'#642
- 'Back in Blue Part 2'#643
- 'Back in Blue Part 3'#644
- 'Back in Blue Part 4'
#1 Fantastic Four (2014)
- 'The Fantastic Four Are Doomed!, Part 4: Four to the Fourth Power!'
#1 FF (2011)
- 'The Fall Of The Fantastic Four Part 1'#2
- 'The Fall of the Fantastic Four Part 2'#3
- 'The Fall of the Fantastic Four Part Three'#5
- 'The Fall of the Fantastic Four Part Five'#6#8#9
- 'East of Eden Part One'#13
- 'East of Eden, Part Five'#14
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#1 FF (2013)
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- 'Doom Nation'#3
- 'Whatever Happened to All Those Reeds?'#4
- 'The Beating of Drums...'#5
- '...The Sound of War'#11
- 'Too Many Kids'#13
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- '27 Minutes'#15
- 'The One Where Power Pack Shows Up'#16
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- 'What Do You Call the Opposite of a Field Trip?'#19
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#1 Free Comic Book Day 2015 (Secret Wars) (2015)
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- 'The Big Goodbye'#3
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- 'The Possible Boy'#12
- 'Mind Mischief'#13
- 'Moloid See, Moloid Do'#14
- 'Bath House of the August Moon'#15
- 'Operation: Latveria'#16
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Gen13/Generation X (1997)
Generation X (1994)
Annual 1995#6 Generation X Holiday Special (1999)
- 'Notes From the Underground'#7
- 'Nights and Bolts'#13
- 'It's All Relative'#18
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- 'Bodies In Motion'#21
- 'To Live and Die and Molt in L.A.'#22
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- 'The Last X-Man'#36
- 'Strange Doings'#37
- 'In Dark Woods, the Night Road Lost'#38
- 'Mystery Train'#39
- 'Return From Forever'#44
- 'Comings & Goings'#45
- 'Lost & Found'#47
- 'She Got Game'#51
- 'The Rescuers'#52
- 'Secret Identities'#57
- 'A Night to Remember'#59
- 'Artie & Leech's Day Off!'#60
- 'Christmas Fear'#68
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#1 Heroic Age: X-Men (2011)
- 'Yes, Jubilee, There Is a Santa Claus'
Hot Shots: X-Men (1996)
Infinity: The Hunt (2013)
Marvel Encyclopedia (2002)
New Mutants (2009)
#14 Official Handbook of the Marvel Universe A To Z Update (2010)
- 'Second Coming: Chapter 11'
#5 Power Pack (1984)
- 'Beetles to Witness'
#3 Secret Wars (2015)
- 'Doomed Youth: Part Three'
#1 The Amazing Spider-Man (1963)
- 'The End Times'#9
The Incredible Hulk (1968)
The Marvel Encyclopedia (2006)
HC The New Mutants (1983)
- 'The Marvel Encyclopedia'
Annual 07 The Official Handbook of the Marvel Universe Deluxe Edition (1985)
- 'Pawns of Senescence'#72
- 'Demon Reign'#73
- 'The Gift'#74
- 'The Right Stuff'
#9 The Official Handbook of the Marvel Universe: Update '89 (1989)
- 'Molecule Man to Owl'
#4 Uncanny X-Men (1963)
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#179 Weapon X (2002)
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- 'The First Foursaken, Part 1 of 3: Pulling Strings'#487
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- 'The Extremists, Part 2'#490
- 'The Extremists, Part 4'#491
- 'The Extremists, Part 5'#600
Wolverine and Power Pack (2009)
#2 X-Factor (1986)
- 'Kickin' It Old School'
#16 X-Men Unlimited (1993)
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X-Men: Millennial Visions (2000)
#2 X-Men: The 198 (2006)
- 'Millennial Visions 2001'
X-Men: The 198 Files (2006)
#1 Xavier Institute Alumni Yearbook (1996)
- 'Invasion of the Baby-Snatchers'#2
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- 'Guess, who's coming to dinner'#4
X-Men: The Last Stand (2006)
First Family (Marvel)
Future Foundation (Marvel)
Generation X (Marvel)
The 198 (Marvel)
X-Factor (Marvel)(01 - Mutants)
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