The New Mutants #49 Trapped in the Future! Which Friend Betrayed Them?  By Marvel Comics.  
They find themselves in an alternate future Earth ruled by their own kind.  March 1987

Written by Chris Claremont
Art by Bret Blevins and Val Mayerik 
Cannonball, Cypher, Mirage, and Warlock navigate a world of mutant dominance and encounter Katie Power to discover the true villains are their former teammates Sunspot and Magma.  Used.

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