Vapor's history prior to being recruited as a technincal specialist by Simon Utrecht has yet to be revealed. She, along with her brother, was among the small group led by Utrecht to simulate the crash that gave the Fantastic Four their powers, and has remained with the U-Foes ever since.

Alongside her teammates, she has had encounters with Hulk, Avengers, Spider-Man, Crossfire, Puma, Darkhawk, and Portal.

Vapor

Vapor, along with her brother, was among the small group led by Simon Utrecht to simulate the crash that gave the Fantastic Four their powers, and has remained with the U-Foes ever since.

Powers

Vapor is capable of transforming her body into any type of naturally occuring gas. Although not much can harm her physically, she is only able to return to human form for brief periods of time.

Abilities

Engineering, physics

Weapons

None

Significant Issues

Avengers #304; Avengers West Coast #53; Incredible Hulk Vol. 1 #254, 275-277, 304-305; Spider-Man: Breakout #1-5

All data from the awesome folks at Marvel.