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Gearhold Stalker (voiced by Michael Dobson): A Slug hunter that was after the Enigmo Slug in Endangered Species. Stalker used two Slug Hounds and Slug Traps to catch the Slugs. It is also said that if you see him it is already too late that is why he is also known as SBD, silent but deadly. He is a master at setting traps.
(Residents of the 99 Caverns) (Recurring characters) -
John Bull (voiced by Lee Tockar): A Slugslinger who is known as the best on the tournament circuit. He owns a Tempesto Ghoul. He was known to beat Eli Shane in the Finals. (Villains/Blakk Industries)
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Powers Triplets (voiced by Lee Tockar): The Powers Triplets, a.k.a. the Power Trips, are a group of slugslingers consisting of two brothers and one sister.
(Residents of the 99 Caverns) (Recurring characters) -
Brimstone (voiced by Michael Kopsa): Leader of the Darkbane and El Diablos Nacho's true master. He desires to conquer both SlugTerra and the Surface. Bears some resemblance to the Devil. In the episode "Light as Day", he is defeated in the final battle and sent again with his army in the Deep Caverns. (Villains/Blakk Industries)
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Glasses (Lee Tockar): A member of the HooliGang. He is short, as well as has been known to create, albeit very bad, graffiti for fun. (Villains/Blakk Industries)
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Lil Stevie:- (Villains/Blakk Industries)
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