The former king, Sombra, is taught freindship by the main five and Starlight.

Twilight and Mud do science

Mud is all grown up, bigger and stronger now, she must learn to keep her strength where it belongs.

The King returns for the last time, this time, he has a new plan.

Short stories about a Kelpie named Mud and her friends

The Mane Six (Starlight edition) find and care for a new creature