Created not only to be Rock's constant companion, but a powerful transportation tool, Rush excels at both. Brave and always willing to stick by his friends until the bitter end, Rush is just about the best friend a robot can have. A favorite around Maverick Hunter headquarters, Rush is unswervingly loyal and gentle to friends while at the same time ferocious and fearsome to enemies. Able to transform into various vehicular modes: Rushjet, Rushmarine, and Rushcoil. He also can merge as power armor with Rock to provide his best friend with added stamina and power, though doing so takes its toll. While he isn't able to speak, Rush is fairly intelligent... for a dog.
Arf! Arf! Arf!, What's That Rush? Timmy Is Trapped Down The Well?