Two friends separated by the stars. One bottle that brings them together.

Moonie and Junie: Interstellar Pen Pals is an enchanting tale of friendship and adventure. Moonie, stuck on a moon with only her rock collection, desperately wants a friend. So she launches a message in a bottle into space, hoping it finds someone who will write back. Meanwhile, Junie, stuck on Mars with her family during a boring holiday, is happy just studying the world around her. But when Moonie's message in a bottle lands in her lap, she can't help but respond.

Soon the two are pen pals, but when Moonie's eagerness for them to meet clashes with Junie's shyness, their budding friendship is put to the test…