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Robo Buck was a robot weasel that was a character in another weasel's mind called Buck.
Robo Buck and his friends, Neil deBuck Weasel and Pythagorus Buck were characters that helped Crash and Eddie understand that the space rocks could save the world. A few days later, when Buck was captured by a a group of dino-birds, once they revealed their plan on surviving the asteroid, in Buck's head, Neil deBuck Weasel admitted that the plan had majored flaws. After the asteroid was diverted, Buck ended up at Julian and Peaches's wedding, dancing, as his figments danced as well.
As a reference, Robo Buck almost looks like those machines in Doctor Who. EXTERMINATE! (First appearance)