All-Star Squadron #14 October, 1982.

On Earth-Two, in 1947, Per Degaton rules the world, and stages gladiatorial arena death-matches among All-Stars, for the amusement of his throngs of loyal citizens ... but only in his dreams. He awakens, and his memory has returned. He remembers both of his previous attempts to take over the world by using Professor Zee's time machine, and vows that this time he will get the job done. He goes to Zee's lab and shoots the old man, and this time he checks his pulse to be sure he's dead. He steals the Time Machine, and goes shopping for futuristic weapons in 1982. In the process, accidentally, he is shunted from Earth-Two to Earth-Prime.