Tarzan discovers his animal friends are sick or dying and with Jane's help they learn the river suddenly contains mercury. Tarzan heads upstream, putting his life in peril after encountering rogue miners.

Tarzan and Simon rescue an injured father and daughter after a fiery plane crash. They discover the cargo included cocaine thanks to Cheetah but the pilot dad declares his innocence and blames a nefarious man named Hauser.

Tarzan takes Carlos, an angry young teen from New York City, whose mother had given up on him and whose father died from a fall on a construction job, under his wing with a trip into the jungle.

Kendra, a spoiled model, arrives at the camp, with her pushy photographer. She offends Tarzan with her furs and fake helplessness, then endangers their lives when she heads into the jungle with her cameraman. Will Tarzan arrive in time to rescue them?

Roger Sr., who funds Jane's research, arrives in camp to end the project and bring Roger Jr. back home. But on a jungle trek with Tarzan, he experiences several revelations concerning the value of the project and his son's part in it.

Tarzan captures a notorious elephant poacher Winslow who than escapes. He tracks down Jane and Roger, who are visiting caves where he has hidden some ivory and takes them hostage.

Jane's extremely fit cousin Patrice comes to visit and shows an interest in Tarzan, making Jane jealous. As Tarzan and Patrice explore the jungle, Jane discovers a bottle of steroids, leading her to confront her relative about endangering her health.

Tarzan discovers the river has oil traces in it, jeopardizing wildlife and Jane suggests it is coming from upstream. Tarzan locates the source, a man named Hauser criminally dumping toxic waste. He vows even Tarzan won't make him stop.

Tarzan rescues a young woman from her crashed plane and it turns out she has a hidden connection to the jungle's past.

Jane is ready to get away from the jungle and spend a traditional Christmas with her sister. She delays her departure when Tarzan needs her help as his elderly chimpanzee friend Maya is sick. In the end the holiday brings sadness but also stronger bonds between Tarzan and his friends.

Tarzan and Jane try to find a family for an orphaned lion cub; Roger teaches Cheetah to play chess; and Simon anticipates a large inheritance.

Jane is angry at Roger, asking for space until she's calmer. Roger heads into the jungle to find a rare specimen to redeem himself but locates a hidden cave. After falling into a cavern filling with water, Roger hopes Cheetah can find Tarzan in time.

Jane's scoundrel ex-boyfriend Jack returns, claiming to be a changed man but she and Tarzan are doubtful. Their suspicions are correct as Jack has located a long hidden trove of riches but needs Cheetah's help to get them.

Tarzan encounters Winslow and his henchman who are intent on robbing valuable relics that were entrusted to Tarzan as a boy. They set off an explosion that leaves Tarzan dazed and gives the men time to complete their theft.

An evil rhino poacher Tarzan sent to prison escapes, and, vowing revenge, kidnaps Roger and Simon to lure Tarzan.

A storm damages the radio and airplane leaving Jane's life in peril after she is bitten by a deadly spider. Tarzan must seek out a native healer he knew as a child as the only way to save Jane.

Edmund Hampton, a retired schoolteacher, arrives at the jungle camp believing it is near an alien landing site. After the concept is explained to Tarzan, a walk in the jungle disillusions Edmund. Yet a mystical experience by Tarzan leads to questions about his special senses.

Gordon Shawn, a noted hunter, comes to the jungle camp and he craves the ultimate experience. Tarzan becomes the hunted.

Suffering from recurring nightmares of the plane crash that killed his parents and left him in the jungle, Tarzan returns to the crash site to make peace with his past.

Tarzan must step in to prevent a tragedy when Cheetah runs away from home, leaving Tantor the elephant heartbroken, and leading Roger to risk his life to reunite the two jungle friends.

Blake returns to the jungle intent on romancing Jane and Tarzan tries not be jealous. Blake also give a ferret as a gift but the animal is a transmitter of a deadly disease and it gets loose. Tarzan must capture it before it threatens the native wildlife.

Tarzan and his friends listen to Simon tell stories as they wait out a severe storm when Jane's ex-boyfriend Jack shows up seeking refuge. Jack promises again he has changed but Tarzan learns he is involved in animal trafficking.

Pesticides are weakening the eggshells of the endangered hawks Jane is studying. She and Tarzan embark on a journey to save some eggs, while traveling their friendship deepens.

Roger Sr shows up and offers Jane the job of her dreams but it means moving away from the jungle. Jane takes time to reflect on her work, her relationships with friends and animals but most importantly, Tarzan.

Roger has written a book detailing some of the adventures that have occurred and during the storm's lull, Jane starts to read it aloud. It seems the way Roger has portrayed events and his heroics differ from everyone else's recollections.