Aquarium staff travel to the island of St. Helena to gain footage of whale sharks in their natural habitat during mating season. Spotted ribbontail ray Francis is introduced to her new tank friends, and Cerbie the seal is treated for joint pain.

The team is eager to open their new alligator exhibit featuring rare albino gators. Sea otter Gibson is tested for a possible infection, and divers must swim with Taroko the whale shark to get a blood sample.

Technology is brought to the aquarium to monitor beluga whale activity; Maggie the small-clawed otter's training kicks in when receiving a shot and Morty the sea star has a checkup after suspicious growths form.

The African penguin colony greets its newest additions after a successful mating season; sea otter Mara is presented to the rest of the raft, and the bottlenose dolphin population in Florida is examined.

A sea lion called Finn has tummy trouble and the team feeds him a snack that will help them investigate why; Big Mama, the guitarfish, may be living up to her name; the boa-duo, Ripley and Ridley, receive a new home.

The staff becomes concerned when Zola, the beloved African penguin falls mysteriously ill. Later, the aquarium witnesses the annual spawning of an endangered coral species, while Maggie the False Map turtle has a date with the dentist.

The staff becomes concerned when Jupiter, the rescued sea lion is not himself. The Ocean Voyager exhibit awaits its new residents black-blotched Fantail stingray siblings, Bacon and Tomato, and Shelley the shy box turtle makes friends.

The team is determined to have Gibson the sea otter pup discover his independence as he separates from his pal, Mara. The African penguins head off-site for spring cleaning, and Thor the moray eel proves he's the ultimate escape artist.