X-amining Marvel Team-Up #100

"And Introducing Karma! She Possess People!" / "Cry -- Vengeance!"
December 1980

In a Nutshell
The first appearance of future New Mutant Karma

Writer/Co-Creator: Chris Claremont
Artist/Co-Creator: Frank Miller, John Byrne (2nd Story)
Artist/Embellisher: Bob Wiacek, Bob McLeod (2nd Story)
Letterer: A Kawecki
Colorist: Carl Gafford, Robbie C. (2nd Story)
Editor: Denny O'Neil
Editor-in-Chief: Jim Shooter

Plot
Spider-Man is possessed by an unseen figure and made to attack a party hosted by General Coy. The Fantastic Four are in attendance, and defend Coy against Spider-Man. When Spider-Man gets the better of them, Coy's nephew Tran secretly intercedes, breaking Spider-Man's possession. The FF take him to the Baxter Building, where a scan reveals evidence of the possession. Mr. Fantastic contacts Professor X, who confirms the presence of a new mutant in the city. The FF & Spider-Man track the mutant to a church, where they encounter a young woman named Xi'an. She tells the heroes of her childhood in and flight from Vietnam, and how her criminal uncle General Coy and her twin brother Tran have taken her younger siblings hostage in order to force her to work for them. It was they whom she was attempting to rescue using Spider-Man (who she believed to be a criminal, thanks to news reports). The FF & Spider-Man agree to help Xi'an, but when they attack Coy, Tran, who shares Xi'an's mutant ability, takes control of the Fantastic Four and pits them against Spider-Man. This forces Xi'an to use her power to counter her brother's, ultimately killing him. Accepting she shares some her brother's darkness, Xi'an christens herself Karma and is reunited with her siblings, as the FF & Spider-Man marvel at her power.

X-amining Marvel Team-Up #65-66

"Introducing Captain Britain" / "Murderworld"
January - February 1978

In a Nutshell
The first (American) appearance of Captain Britain, Arcade, and Murderworld.

Writer: Chric Claremont
Penciler: John Byrne
Inker/Colorist: Dave Hunt
Letterer: Bruce P. (issue #65), Tom Orzechowski (issue #66)
Editor: Archie Goodwin

Plot
Issue #65: After Peter Parker learns he's been assigned a new college roommate in the form of the British Brian Braddock, he shows him around town, while the assassin Arcade is hired by representatives of the Maggia to kill Braddock, whom they believe may be Captain Britain. Later that night, Brian spots Spider-Man leaving Peter's room and, believing Spider-Man to be a criminal, chases after him as Captain Britain. The two fight until Spider-Man is able to convince Captain Britain he and Peter Parker are friends, after which the pair is kidnapped by Arcade. Issue #66: Captain Britain & Spider-Man fight their way through Arcade's Murderworld, with Captain Britain trying to save his captured girlfriend Courtney Ross and Spider-Man figuring out a way into the access tunnels of the place. He is able to trigger an overload of the system, which the heroes use as cover to escape into the sewers. Emerging in the city, they learn from police captain Jean DeWolffe that the European Maggia who wanted Captain Britain dead have been taken out. Elsewhere, Arcade stands in the ruins of Murderworld, vowing to rebuilt it better than ever, then to invite Spider-Man for a rematch.

X-amining Marvel Team-Up #150

"'Tis Better to Give!"
February 1985

In a Nutshell 
Spider-Man and the X-Men team up to fight Juggernaut and Black Tom. 

Writer: Louise Simonson
Artist: Greg LaRocque
Inker: Mike Esposito
Letterer: Janice Chiang
Colorist: Bob Sharen
Editor: Danny Fingeroth
Editor-in-Chief: Jim Shooter

Plot
In New York, Spider-Man returns home and unsuccessfully attempts to dodge his landlady. In Asia, Juggernaut returns to the temple where he received his powers and takes the Ruby of Cyttorak, intending to give it, and thus the power of the Juggernaut, to Black Tom for his birthday. Back in New York, the X-Men complete a training session in the Danger Room, after which they see a news report on Juggernaut's Asian rampage. Seeing the same report, Spider-Man leaves his apartment to check the city for Juggernaut. Meanwhile, Juggernaut arrives at Black Tom's birthday party in Manhattan, and gives him the Ruby of Cyttorak. When he touches it, Tom suddenly grows in size and mass to match Juggernaut. At the X-Mansion, Nightcrawler uses Cerebro to locate Black Tom, and the X-Men head into the city. In Manhattan, an angry Tom demands that Juggernaut turn him back to the way he was, and a fight breaks out between them that spills out into the streets.