Vapor

"That could have gone better."

Doctor Ann Darnell, better known as Vapor, is a member of the U-Foes. She is the sister of X-Ray.

Once the experiment started, Rick Jones alerted Bruce Banner that the United States Army were on their way to arrest Utrecht. As the Hulk, Banner reached Utrecht Laboratories where he found an antennae on the roof that was generating massive amounts of radiation. He destroyed the antennae and the building, but Darnell and her fellow contributors emerged from the wreckage as the super-powered U-Foes. They decided to teach the Hulk a lesson and fought against him. They were defeated, but vowed to kill the Hulk if he got in their way again

Powers

 * Gas transformation

Abilities

 * Fighting