Kevin and Annie find an abandoned dinosaur egg. Once the egg hatches, Annie names the dinosaur Tasha.

Tom believes other people might be in the Land of the Lost and discovers Christa, the jungle girl. She helps find an antidote to save Tom after a poisonous lizard bites him.

The Porter family goes searching with Tasha to find a way home. Unfortunately, they run into creatures called Sleestak and their leader, Shung. The Sleestak steals the family car and captures Tasha.

The alignment of the three moons causes the Land of the Lost inhabitants to act strangely, including Stink and Tasha. They Stampede towards the Valley of Death. Meanwhile, Christa and the Porters race to save their friends from death.

Annie finds Shung’s magic crystal sword, which gives her powers she never dreamed of. However, its evil nature slowly changes her for the worse, and she begins acting like Shung.

Annie’s pet dinosaur, Tasha, gets in trouble once too often, so Tom decides she should be returned to the jungle to fend for herself.

A Knight named Sir Balen finds his way in through a portal into the Land of the Lost.

A volcano erupts, and lava is moving straight for the Porters treehouse.

Shung finds one of Christa's keepsakes and uses it to establish a hypnotic mind control over her.

A series of earthquakes convinces Tom a new dimensional gate will soon materialize, so the Porters head out to find it.

Tom and Kevin encounter Sleestak when they venture to the distant lake to find water.

Kevin is convinced that Stink is the culprit when objects start disappearing from the tree house.

When the last of the Porter’s batteries stop working, Tom sets out to find a replacement energy source and enter into Sleestak territory.

Annie befriends Keela, a sorceress banished to the Land of the Lost by an evil king. Trouble is right behind her as an evil sorcerer is pursuing her.

An old Sleestak machine is responsible for creating the illusion of a suburban street complete with the Porter’s old house.

Kevin and Tasha meet Opah, an old Paku who is Stink's grandfather, and learn his old ways may indeed save their life.

Shung uses his crystal on Christa to summon the Porters, who are then forced to fight each other for his entertainment.

Annie befriends a fish-man creature named Namaki, who helps Christa recall the night she was separated from her family and left in the Land of the Lost.

After an argument with her father, Annie heads for the jungle, where she meets time traveler Simon Cardenas.

Namaki, Tasha, and Stink search for the missing Porter held captive by a shape-shifting siren.

Kevin visits the Valley of Death, where a spit-viper blinds him. Can he rely on Tasha to lead him back home?

When Tom discovers the tree house support poles that have been damaged, Tom leaves Annie in charge while he and Kevin go out to cut new logs.

Stink explores Sleestak ruins, where he finds a light gun, which transforms him into a macho tough guy, and goes looking to take on Scarface.

Kevin manages to ask Christa out, but his reliance on the demon drink creates more problems than it solves.

Annie puts a spell on her brother and must consult her spell book so she can break the spell, only to learn that the Sleestaks have taken it.

Stink falls off of the tree house roof and injures his ankle. While recuperating, he is given a bicycle horn to honk when he needs something. Tasha discovers that Stink is faking the injury, so Kevin gives him some of his own medicine.