The Playtown Mystery Mister T : Season 3 Episode 4

Just because someone's young, it doesn't make them worthless nor unbelievable. Jeff and Woody know that for a fact now. Back then, while the team was having a free tour of the Play Town amusement park, Spike saw two of its mascots, Marvin Mouse and Dingy Dog, acting suspicious and no one wanted to believe him. In truth, they were career criminals dressed as mascots in order to retrieve gold bars from an active gold refinery in Play Town's Frontier Town section.