“Expiring Minds”
From page 1: "Vril Dox: Super-intelligent founder of the interplanetary police agency L.E.G.I.O.N., now a fugitive from his own organization... along with Stealth, Telepath, Phase, Borb Borbb, Strata, and Garv, former L.E.G.I.O.N. officers, now Vril's fugitive [comrades...] have set their ship's course for the planet Cairn, where they intend to mount a last-ditch assault against L.E.G.I.O.N. leader Lyrl Dox, Vril and Stealth's power-mad son... who is cementing his rule by broadcasting a powerful mind-control wave throughout the galaxy."