The Mighty Space Mouse - S1.E46

A series of unnatural earth tremors frightens the Space Mice into action. Rather than running or hiding, they begin to train like soldiers, and fight a pitched battle against the Blue Cat. The back them up, Pidge builds them their very own robot vehicle, a flying mouse. Voltron is trapped by a powerful underground Robeast and it's up to the Space Mice to launch a rescue mission!