The opening credits sequences used for first-season episodes included a glimpse of the Mission Monitor Board signs for many Legionnaires as well as shots of flying Legionnaires who would be seen in later episodes (though not all of those with Mission Monitor Board symbols appeared). At least four members of the Legion as seen in the comics appeared in some way on the show but had not joined by the end of the first season (Ultra Boy, Lightning Lass, Wildfire, and Polar Boy).