Dib is the only human on Earth that knows the alien invader ZIM's true identity and he will stop at nothing to find ZIM. His obsessive watching for ZIM has left him physically disgusting. When he finally heads into battle with ZIM, it is his sister, Gaz, that saves the day.
Sam the dog detective is anxious to sniff out another mystery when she sees strange lights in a nearby field and jumps to the conclusion that they must be alien ships.
Astronaut Dmitri returns home after two-and-a-half years on the moon to find that people have forgotten all about him, but his lunar pal Lulu, who has stowed away in Dmitri's bag of rocks, jogs everyone's memory.
After Martians land on Earth just outside of London in the late nineteenth century, an Englishman tries to find his wife while the British military and human technology fail in their efforts to stop the Martians, which have begun to kill and feed off of humans.
Explores the idea that there are other beings than humans in the universe and that they have visited Earth throughout the history of mankind, discussing UFOs, alien abductions, crop circles, possible alien influence on early cultures, and more.