Appearing in "Sibling Rivalry"
- Professor X (Charles Xavier) (Main story and flashback)
- Juggernaut (Cain Marko) (Main story and flashback)
- Michelle (Only in flashback)
- Trudy (Only in flashback)
- Brian Xavier (Mentioned)
- Cyttorak (Mentioned)
- Westchester County
- Asia (Only in flashback)
Synopsis for "Sibling Rivalry"
- Synopsis not yet written.
- All issues of this title had a cover price of 99 cents.
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- Images from Professor Xavier and the X-Men Vol 1 12
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