Blackout Ray is a weapon used by Dr. Two Brains and Glen Furlblam, seen in the episode Dr. Three-Brains. It is able to black out any nearby lights. Two-Brains created it in the prison arts and crafts room.

Its side effect was that if used too often, it could black out all the lights in the city.

Two Brains' Blackout Ray!

Dr. Two Brains shows his Blackout Ray to Glen Furlblam

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