After Alex leaves the island, and Selkie the sea lion is kidnapped, Nim accidentally stows away on the cruise ship that took Selkie, in the hopes of rescuing her and bringing Alex back.

In a school assignment, seven-year-old Moses, who has spina bifida and uses a wheelchair, reflects that his neighbor's disabled iguana resembles him because they both have figured out how to get where they want to be in different ways than those around them.

"Iguana is worried he is not amazing enough to go to Cheetah's party, but he soon learns that being himself is always enough"--

When Danny and Wendell find an injured bat at the neighborhood pool, they take it to Mexico where Danny's cousin, a bat specialist lives, but once there Danny is snatched up by a giant bat monster, and it is up to Wendell to save him.

"Pigmund and Lizárdo are free! It's true. Pigmund and Lizárdo recently 'declared independence' from their petting zoo. And now this pot-bellied pig and iguana are out to SEE THE WORLD. They are: THE UNPETABLES - and they're available for temporary work as FREELANCE PETS. But no matter what gigs THE UNPETABLES may get, they have one very big rule: NO MORE PETTING! Will The Unpetables find the independence they're looking for? Or will Maintenance...

Hank has never been fond of his sister's pet iguana, and their relationship worsens when she lays her eggs inside his science project.