Adventure Comics 340 (Jan 1966) VG+ (4.5)

Computo the Conqueror!

Script: Jerry Siegel

Pencils: Curt Swan

Inks: George Klein

Letters: Milton Snapinn

Characters: Legion of Super-Heroes [Ultra Boy; Matter-Eater Lad; Star Boy; Element Lad; Brainiac 5; Chameleon Boy; Phantom Girl; Lightning Lad; Saturn Girl; Superboy; Mon-El; Colossal Boy; Sun Boy; Light Lass; Cosmic Boy; Triplicate Girl; Shrinking Violet]; Computo; Proty II; Android Master

Synopsis: Brainiac 5's latest creation turns on its master and the rest of the Legion.