Astro Mouse is depressed. He misses his family and home. They have been drifting in space for so long they hardly remember when they last saw Earth! Light Bulb, Lamp, Astro-Chicken and the soldiers from planet Bubblegum try to cheer their friend up. Nothing works until they find a strange planet that looks like...Wait! It's Earth! Unfortunately, Earth has changed a lot and it's overrun with dinosaurs...Where have our space heroes landed? Are they in the past or...the future? Will Astro Mouse reunite with his family ever again?