Chaos erupts when Moe and Shirley invite some visitors from outer space to stay for dinner with the relatives.

When their brother who has been missing for fifteen years suddenly returns, changed, Evie and Kass Shao must cast aside their differences to hide him from the FBI and an entire alien army who are in fast pursuit.

At sixteen, Ariane Tucker has been careful to elude those seeking her since her escape from a genetics lab ten years earlier, but the attention of classmate Zane, both frightening and intoxicating, tempts her to risk violating at least one of her adoptive father's five simple rules.

After heroically saving his classmates, fifth-grader Sawyer's life as a dinosaur-human hybrid has gotten a lot easier until Sawyer, Sylvie, who is part Martian, and Elliot head to Mars in search of Sylvie's missing dad and discover that Mars is trying to kick Pluto out of the solar system.

Illustrations and rhyming text reveal the true reason aliens visit Earth is that they deem underpants so much fun to play with.