The Thea Sisters are in for a great adventure when they are invited by a professor at Mouseford Academy on a trip to the moon.

When Willoughby Smith discovers the moon is in his closet one night, he befriends a snail on the moon and the two help each other overcome their fears.

When Moon Base Alpha's commander mysteriously vanishes, twelve-year-old Dash Gibson and his Moonies friends struggle to figure out what has happened, a situation that is complicated by Dash's secret contact with an alien.