When thirteen-year-old Ellie's Grandpa Melvin, a world-renowned scientist in the body of a fourteen-year-old boy, comes for an extended visit, he teaches her that experimenting--and failing--is part of life.

It seems that everyone at school has taken up snowboarding, so Babymouse decides she must hit the slopes, too.

Starting a new school year, Squish, a meek amoeba who loves the comic book exploits of his favorite hero, "Super Amoeba," is determined to get picked for kickball and hang out with the cool kids.

An imaginative young mouse is terrified to face her enemy in dodgeball, but with the help of her best friend and support from her mother, she not only plays the game, she proves herself a hero.

An imaginative mouse who likes to read heroic fantasy novels finds herself on the school math team as it prepares to compete for the coveted Golden Slide Rule.

Squish the amoeba neglects his homework, parents, friends, and even his Super Amoeba comic books when he discovers the video game Mitosis.

As tryouts for the school musical begin, Babymouse takes the starring role in several imaginary Broadway productions, which also feature her debonair new classmate, Henry the hedgehog.