Carol Frost is a scientist who worked for William Stryker.
Carol worked with Stryker when they were testing on Wolverine. At Alkali Lake she told Wolverine to think of why he was doing this while undergoing the procedure, saying it might help to deal with the intense pain during the adamantium bonding process. She was the aid who called out Wolverine's pulse to Stryker during the experiment.
Carol was also at the island later, helping to build the Weapon XI. When Stryker told her to get it ready, she said that it wasn't finished but he said just go. This is why Deadpool lost powers after the fall.
- In the comics her name is Carol Hines but her surname was changed to Frost for the movie. The reason for this decision remains unknown.