Watch full Road Rovers Episode 6 online full HD online. Cartoon video Road Rovers Episode 6 online for free in HD. The Dog Who Knew Too Much. One dog has the answers to a rash of human and canine kidnappings, and becomes a temporary Road Rover so he can testify. However, Sport, the name of the dog, had somewhat of a big mouth and tried talking himself out of certain situations. This episode's title is a play on the title "The Man Who Knew Too Much".