A routine plane trip to gather some endangered fish ends in near tragedy when Nicole and Jonah's pilot has a heart attack in flight. Nicole must land the plane with help from J.L. and Grant via radio.

Grant, Nicole, and ornithologist Jeff Storey head to Raven Island to determine the extent of a viral outbreak. There they encounter a reclusive artist bent on remaining alone.

Grant must juggle his responsibilities at the Aquarium caring for a soon-to-be orphan otter pup with his fledgling relationship with J.L. The frosty disposition of his new assistant adds to the mix.

After Grant and J.L. find a young South American girl hiding in the Aquarium's Amazon exhibit, J.L. decides to become the girl's guardian and must quickly adapt to motherhood.

Jonah & his friends decide to take action into their own hands when their favourite forest is threatened by the logging industry. Grant is forced to confront the fact his son is growing up and has a will of his own.

A wayward wildcat terrorizes Vancouver and the Roberts & Co. do their best to return the creature to the wild before amateur hunters can get to him. Meanwhile Donna must decide whether or not to leave the Aquarium and accompany her husband to Ottawa.

Jonah can't wait to get to know Jean-Paul, a friend of Grant's who has come to visit and has a sports car! While Grant works on a machine which might be able to re-create the songs of whales, Jonah learns that appearances can be deceiving.

A storm hits Danger Day and Nicole finds herself home alone. During the storm a boy turns up on her doorstep. He has runaway from home and Nicole must help him to see that runawaying doesn't solve problems, before the storm ends and its too late.

A man working at a circus helps an old female seal to the Aquarium hoping that she can live in peace, in return he takes a younger seal. Grant and Nicole are able to find the seal and kidnapper by an electronic tracking device and decide to take pity on the old man and do something for him.

Grant learns to let Jonah work through his own problems now that he is getting older.

Grant receives some upsetting news when he learns that a friend who lived in Africa has disappeared. It troubles him to the point where he considers going to Kenya. His children don't want to go and J. L. can't seem to get through to Grant, which leaves it to two boys who Grant meets on the beach.

Nicole goes away for the weekend to visit her friend Heather, J. L. accidently finds out that Heather's father is David Cormier, an old flame of hers from the past. Grant, finding out all this, insists that J. L. tags along, only she starts to fall for David again which doesn't please Nicole.

Grant gets concerned when the otter's appear to have disappeared from the bay. He sets out in the boat with Jonah and Doug to try and find out what has happened to them.

A young man who has just been employeed at the Aquarium can't read or write. When Nicole finds this out she seeks to help him learn before it to loses him his job.

Billy tries to teach a young boy sign language so he can communicate with a chimpanzee. But when an evening of fun ends up in lots of misunderstanding between the boy, Tracy and Nicole.

A Rock Star films a rock video at the aquarium. Nicole auditions to become one of the dancers in the video and her friends become jealous of her when shes picked.

Suspicions are very where, but especially focused on Nicole's new friend Tracy who has a bit of a bad reputation.

While Jonah and Grant are out fishing they start getting bites from big fish. Earlier in the day they had been joking with George over the very same thing. But when more and more oversized fish are found, Grant realises that someone must be genetically changing the salmon's size and must stop it before the food runs out and species die out.

George & the Roberts family go away for the weekend after George's friend invites them to stay at the island resort ""Sylvan Shores."" When they find the resort on the verge of closure, they each pitch in to keep it running long enough to impress some visiting investors.