Strange occurrences happen in the museum during the Spiez' field trip. Prehistoric creatures come alive. The Spiez investigate when they discover that an anthropologist acting like a caveman plans to return the world into the dinosaur age. The Spiez get trapped in an erupting volcano, but escape. They hurry to their hometown to finish destroying the dinosaurs and defeating the anthropologist just in time to get home before their parents arrive. In the B-story, Megan thinks that their parents are having a baby girl and is jazzed that she will not be the only girl.

When agent Britney disappears while investigating the disappearance of Dean, the Spiez are called in to assist the investigation and to save another spy, Blaine, from getting abducted, but they fail to rescue him. Later, Lee gets annoyed when he is put under supervision of a babysitter, although he is 13. So he sneaks out of the house and then is abducted by the same kidnapper. Their babysitter, Malinda, is really an ex-Woohp spy in disguise, and is the one who is kidnapping the agents.

When a few disappearances occur, the Spiez investigate. While spying in the room of one of the "victims", Tony finds adventure cards that are supposedly a special edition. The cards turn out to be clues. While walking on the street, a truck almost hits Tony, but he throws it to the other side of the road and figures out that he has super strength. When the other three Spiez are on the mission, they find out that whoever touches the cards gets the power of the character in it. In the B-story Tony wants to be stronger and taller.

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