Superboy-Prime has a fear of the Flash Family, due in large part to them pushing Superboy-Prime into the Speed Force, where they imprison him under red sunlight to depower him for several years until he breaks out. He reveals his continued fear of them, when during the "Sinestro Corps War", he is confronted by Wally West and Jay Garrick, whom he admits with a stutter "I d-don't like Speedsters!" This fear is again on display in "", when he lapses into a fearful stutter while recounting his battle with the Flashes during "Infinite Crisis". Upon learning of the Legion's attempts to bring Bart back, Prime goes into a panic, going so far as to fly through his own Legion's forces as to attempt to stop Bart from returning; yelling and stuttering, even whimpering to himself in fear as he does so. Upon realizing that he is too late, Prime even screams in fear upon seeing the returned Kid Flash racing towards him.