"A.J. and the gang at Ella Mentry School are in for a super surprise when a new teacher, Mr. Cooper, take over their third grade class"--

"In 1947, during the early years of the Cold War, a field in Roswell, New Mexico was disturbed by a strange crash and smattering of debris. Some say the bodies of extraterrestrial beings were strewn across the ground, that a UFO had crashed there, and that the government was covering up the evidence in a massive conspiracy. But what really happened at Roswell? The infamous "crash from outer space" has become a fixture in our culture, inspiring a surge...

Buster tries to convince Arthur, the Brain, and his other friends that he not only saw a UFO but also a comet heading for the earth.

Agoraphobic high school junior Mallory's life centers on an online forum about aliens and going to school by computer until a prank lands her on the Homecoming court.

The Dangerous Snake and Reptile club, with the help of a boy visiting the neighborhood, sets up equipment in the clubhouse in hopes of tracking flying saucers and making contact with aliens.

When Darren Stonkadopolis claims he's had a close encounter of the stinky kind, the other Fart Squad members think he's full of hot air. But then the alien Stink Weeds descend, and the Fart Squad is forced to smell the truth. It'll take some weed wacking, some stealthy stench tactics, and buttfuls of gas so smelly they'd make the sun blush to stop these mutant extraterrestrial vegetables from universal stinkination.

After watching a movie about aliens during a sleepover, budding scientist Art Smart and his friends spot what looks like a purple space ship headed their way. Each chapter ends with facts about such topics as UFOs and space exploration.