Power Rangers: Season 4, Episode 7

4 - 7: Every Dog Has His Day

A talented police tracking dog called Smokey is looked after by Katherine, but Smokey's instincts lead both of them to uncover a meticulous drilling operation conducted by Machine Empire lackeys under the command of the Digster robot. Injured in a fall, Katherine is unable to morph and dispatches Smokey to find the other Rangers before Digster's operation unleashes a river of molten lava on the city...