Professor X designed these lightweight, flexible metal braces for his legs, using a transistorized power source hooked onto his belt to operate them for several hours at a time.
Xavier then used the legs to approach in disguise the Locust.
After a few days, he attempted to use his transistorized leg braces again, but his power source failed.
Later, his Mechanical Legs were once again seen in use to walk to The Warlock's arena. 
- 4 Appearances of Mechanical Legs
- Minor Appearances of Mechanical Legs
- Media Mechanical Legs was Mentioned in
- 1 Images featuring Mechanical Legs
- Item Gallery: Mechanical Legs