Stargrave wants the Legion's assistance to gain total control of the universe! And Brainiac 5, after discovering that Stargrave is his father, agrees to help.
Pulsar Stargrave, Quicksand and Holdur attack the Legion of Super-Heroes and defeats them in battle. Pulsar Stargrave, who bears a striking resemblance to Brainiac 5 and also hails from Colu, informs Brainiac 5 that he wants to rule the universe and somehow convinces Brainy that the Legion should help him accomplish that goal. It is revealed that Brainiac 5 believes Pulsar Stargrave is his father.