Stella loves the stars and gazes through her telescope every chance she gets. Little brother Ryan loves nursery rhymes, and is convinced that if you look long enough, you'll see a cow jumping over the moon! One night, Ryan's favorite teddy bear goes missing, and the two siblings notice a new constellation near Great Bear and Little Bear: a Medium-Sized Bear! When Ryan extends the telescope and climbs into space in search of his bear, Stella has no choice but to follow.