Danger Mouse is left gadget-less when an unappreciated Squawk leaves the Danger Agency to work for tech genius Elon Muskrat.

The danger agents are at Squawk's super-secret Wild West testing facility, home to a society of Penbots, robots who have a rather familiar face. Squawk is sure she's improved upon Penfold and made the perfect robotic sidekick for Danger Mouse, Tenfold. But Tenfold malfunctions and transforms into the ruthless Meanfold, determined to destroy anyone who's not quite perfect.