Religion: not determined yet
Alter Ego: Kevin Sydney
Other Names: Kevin Sidney; "Master"; Number Two; John Askegren; Jack Bolton; Martina Johanssen; Werner Reiman; Charles Sage; Francisco Zerilli
First Appearance: The X-Men (vol. 1) #35 (Aug. 1967): "Along Came a Spider..."
Super? (Has Super Powers/Special Abilities/Technology): Yes
Number of Appearances: 23
When Kevin Sydney first appeared as a distinct character, it was as the mysterious "master" or deputy leader of Factor Three. He was not yet identified by name. This was in the issue #35 of the original X-Men series. It was until later that the name of the "master" was revealed. He was the mutant named "Changeling."
The Changeling was seen again in the next issue, X-Men (vol. 1) #36. Once again he appeared briefly as a mysterious figure. He wore a strange helmet and his name had yet to be revealed.
The mysterious figure was finally identified by name as "The Changeling" in the next issue, X-Men (vol. 1) #37.
The Changeling was later recruited to impersonate Professor Charles Xavier. He used his metamorphic power to appear as Professor X. Furthermore, the real Charles Xavier temporarily imbued him with limited telepathic powers.
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