Treble (known in Japan as Gospel) is a wolf-like robot created by Dr. Wily. He serves as a support unit for Bass just as Rush assists Mega Man and possesses similar abilities. Treble is aloof and aggressive, but also extremely loyal to Bass and will follow him everywhere.
- Treble Flyer - A jet form much like the Rush Jet. This mode has only been seen in the anime opening for Mega Man 8.
- Howling Buster - In Mega Man 2: The Power Fighters, Treble supports Bass in a more offensive manner by firing energy blasts from his mouth.
- Treble Charge - Also in Power Fighters, Treble surrounds himself in a barrier and performs a charging attack against Bass' opponents.
- Super Adapter - In Mega Man 7, Bass stole Dr. Light's schematics for the Super Adapter from Light Labs, which Dr. Wily adapted for Treble. And so, like Mega Man and Rush, Treble can combine with Bass by turning into armour. This increases Bass' offensive abilities and grants him flight.
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