Biker Mice From Mars 2006 Episode 25 - Once Upon a Time on Earth - Part I Episode Title:Once Upon a Time on Earth - Part I.Episode Description:Stoker finishes his new Regenerator and the Biker Mice are ready to take it back to Mars. Unfortunately, Stoker himself has other plans for it even when an unlikely enemy of the Biker Mice poses as a government agent to collect the aliens hiding out on Earth.