Justice League of America (1960-) #48

Having found an ancient book that appears to indicate that he once defeated the JLA, Xotar travels from 11,960 to the present to test four weapons against the Justice League in order to determine which weapon will help him defeat the Intersolar Police of his own day. But the JLA counters each of Xotar's weapons and returns him to face justice in his own time. Secret of the Sinister Sorcerers!