Grandpa accidentally feeds Heathcliff some Super doggy Vitamins. Gradually, Heathcliff undergoes a startling transformation which includes barking at trucks and passing up fish in favor of bones. Worst of all, he finds himself feeling friendly toward Spike. Heathcliff eventually sets things straight by taking a massive dose of cat vitamins, with Iggy's help. / The cats put a new engine into the Catillac not realizing it is a time machine engine of Professor Craziloon. Before they know it they're back in the old West. After a few close calls with some rough and tough characters and a wild stagecoach chase in pursuit of their stolen caddy, they get the car back in the nick of time to be transported back to the future.