 In "Adventure Comics" #367 (April 1968), Brainiac 5 first discovered its function and used it to repel an invasion of Earth by the Dark Circle and to create a new headquarters for the Legion.One of the Controllers briefly appeared and cautioned against its further use, saying a stray thought could cause catastrophe.The Legion sealed it inside an Inertron block, vowing only to use it for the direst of emergencies, or at a future date when mankind can use it wisely.