Pattie, an ambitious and daring mouse has big dreams to be an adventurer and a hero. When her homeland in Ancient Greece is threatened by Poseidon himself, Pattie is determined to save her city. Defying the odds, the gods, and the wishes of her feline father figure Sam, she embarks on an epic sea quest to save her city. When Pattie and her eccentric crew set sail they come face to face with a giant octopus with a runny nose, a crew of friendly mafiosos, and a swath of Greek mythology's most bizarre creatures. Undeterred, Pattie's bravery, leadership, and masterful planning inspires her crew to realize that true heroism knows no size.