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This article is about a/an kaijin in Kamen Rider Black RX.

A flea-like monster. He can launch a stinger from his mouth and shoot lasers from his eyes. Mundayganday was the one responsible for killing Kyoko Matoba's parents. He, Gedorian, and the Chaps were attacking a reservoir in an attempt to stop the flow of water into the city because Maribaron was delivering water to people as part of their plan to take over earth. When Kohtaro, Reiko and Kyoko arrived at the reservoir and were attacked by Mundayganday, Kohtaro transformed into Kamen Rider Black RX and fought him until Gedorian and the Chaps trapped him a slime-like substance shot from their bazookas. RX became Bio Rider and destroyed Mundayganday's exo-skeleton with his Bio Blade. He then reverted to RX and destroyed Mundayganday with his Revolcane.

See also