4x1 - Melissa's Gift

October 7, 1987

Jonah and Nicole take George's niece Melissa to the country where they come across an injured coyote pup. When Melissa becomes attached to the pup, the Roberts must convince her to return him to the wild where he belongs.

4x2 - A Tangled Web

October 14, 1987

While exploring Bailey's Cove, Jonah & Nicole come across a deep sea gill net that could ensnare the area's sealife. Soon after they meet Agnes Calhoun, an old friend of Grant's with a history of aggressive ecological crusading, who inspires Jonah to try to tackle the net himself with near-deadly consequences.

4x3 - Pets and Peeves

October 21, 1987

4x4 - Roots and Wings

October 28, 1987

Lying and cheating is not what a healthy relationship is about, unfortunately Jonah learns that the hard way. After getting a new girlfriend, he wants to impress her in every way, because she's wealthy and he doesn't want to lose her.

4x5 - The Dying Swan

November 4, 1987

While a member of the school gymnastics team, Nicole befriends a girl whose mother was once a prima ballerina now confined to a wheelchair and must help convince her she can still lead a normal life following her accident.

4x6 - Protege

November 11, 1987

Grant and his new protegé intern work to devise a kit to detect the presence of the toxin known as ""Red Tide."" When their attempts fail, Grant is saddened to discover his assistant's ambition for fame overshadowing his professional ethics.

4x7 - High Flyer

November 18, 1987

The presence of an avian virus affecting the chicken farm of one of George's old friends leads the gang to an illegal smuggling ring dealing in rare birds. One of the persons involved in the ring is revealed to be J.L.'s new pilot, Rick, who takes Nicole on one of his runs.

4x8 - It's a Jungle in There

November 25, 1987

While Jonah works up the courage to ask Nicole's friend Emma to a dance, Zuzette, a biologist on exchange from France, races to collect five tropical frogs that accidentally escaped from their aquarium.

4x9 - Castaways

December 2, 1987

On the ninth anniversary of his wife's death, Grant takes Nicole deep sea sailing. When they're suddenly caught in a squall and forced to abandon ship, J.L. and Jonah fear the worst.

4x10 - Love Game

December 9, 1987

4x11 - Deep Trouble

December 16, 1987

While enrolled in a scuba diving certification program, Jonah and his friend Derrick accidentally injure a wolf eel with an underwater spear gun. When Jonah takes the blame, Derrick must decide whether or not to come forward and face the music.

4x12 - The Smiling Dolphin

December 23, 1987

A visit from an old friend drops a much sought-after dolphin statue in Nicole's possession. When an art collector will stop at no means to get a hold of the artifact, the Aquarium staff race to uncover the secret behind it.

4x13 - Pilot Error

December 30, 1987

4x14 - Hand to Hand

January 6, 1988

The Roberts discover one of their favourite forests has been bought by a survivalists school. When Jonah decides to enroll, he is put to the test in a competition against the school instructor's daughter.

4x16 - The Only Way Down Is Up

January 20, 1988

Nicole is injured during a mountain climbing practice and develops a fear of heights. When she decides to continue with her climb, she is forced to confront her fear when a dire situation arises.

4x17 - Covert Operation

January 27, 1988

Grant and Jonah recover an injured seal and discover a mysterious implant in it's brain. When an intelligence agent decides the seal must be killed, the Aquarium staff race to save the creature's life before it's too late.

4x18 - Second Best

February 3, 1988

The Roberts assist in an archaeological dig in a nearby forest: Grant must deal with an arrogant paleontologist convinced her theories are correct, while Nicole must handle a fellow student who keeps stealing her credit for unearthing fossils.

4x19 - Eagles Fly Alone

February 10, 1988

The Aquarium staff investigate a series of wounded bald eagles that leads them to a nearby flying school and a pilot with a vendetta against the creatures. Grant must convince local farmers to stop aiding the man in wiping out the eagles from the area.

4x20 - To Glimpse a Unicorn

February 17, 1988

When a killer whale carcass exhibits some unusual wounds, the Aquarium determines it to be from a wayward narwhal trapped in a nearby channel. When a wealthy philanthropist offers to finance the expedition, Dr. Roberts and his children jump at the chance to track the rare creature down, but are his intentions truly humanitarian?

4x21 - A Man's Sport

February 24, 1988

4x22 - Put a Little Back

March 2, 1988

Upon returning from a camping trip to visit his old friend Pete, Grant discovers he is the recipient of the Fairfax Award worth sixty thousand dollars. When it is revealed the award is a distraction to the environment damage caused by the company sponsoring the award, Grant must decide whether to accept it or refuse.