King Tut has relapsed into his kingly ways, this time showing a marked interest in scarab beetles and apothecary potions. Robin infiltrates their hideout to discover their true intentions, relaying what he hears to Batman, but their plan is put in jeopardy when Robin's presence is detected.

Using resurrected scarab beetles, King Tut concocts an ancient mind control potion, abu raubu simbu tu. Chief O'Hara is the first under his spell, followed shortly by Commissioner Gordon, and when Batman himself is tricked into taking the drug, Tut's plan to control all of Gotham City by tainting the water supply seems close to succeeding.