Following up on the triad of temporal terror known as Brainiac, Mister Mind and the Great Red Brain... we have some even more terrifying troublemakers. These three increased the level of threat not only with their analytical nature but the immense power emitted from their enigmatic frames. There was Pulsar Stargrave who states he is the 30th century manifestation of Superman's old foe Brainiac, only now possessing stellar abilities that made him more than a match for Earth-One's Legion of Super-Heroes. Then there was Akhet the Star-Smasher, a gigantic being who radiated enormous energy from his frame which initially overwhelmed the All-Star Sqaudron of Earth-Two. And last but not least is Mister Mind's robot bodies during the golden age, presenting a challenge by Earth-S' Captain Marvel.
Each of these individuals were synthetic creatures,crafted by their creators to conquer worlds. Pulsar reverted to a form of his original body after having become a completely metallic entity of a distant robotic race in space, complete with his own Skull Ship in the 1980s. Akhet was tethered to his Flying Eye Ship which harnessed the vast mental abilities of leading scientists from around the world. And Mister Mind accessed Sivana's weird shaped craft shaped after his skull and a mechanical Rabbot.