Writer identified by Martin O'Hearn. Previous indexer thought that Mort Weisinger had co-written it.
Includes letters from Larry Eaton, Steven Gendler, Ned Snively, Amy Bloom, Larry Leichter, Grace DiGangi, Gary Inge, Myrt Gallagher.
Beginning of first regular Legion series. Mon-El becomes a member of the Legion in this story.