It was created by the mutant Hecate, and it included other mutants such as Bishop, Shard, Randall and Malcolm. During a mission in which Bishop was chasing a criminal called Trevor Fitzroy, he finished in the Earth-616. There he met Professor Xavier and his X-Men who helped him catching Fitzroy and eventually he decided to stay with them.
Nowadays, most of the members of the XSE are deceased.
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