The Brain Gladiator is the second of Dr. Loboto's mechs in Battle World. It was created from the remains of the Weekee cyborg Phobius. Dr. Loboto fought Optimus Prime with it in order to get rid of the intruders inside of the Cosmic Graveyard. However, the mech was destroyed when Optimus threw it at the magnetic crystal keeping the defeated characters in limbo.

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