Adventures in Dinosaur City

They place a videotape into an experimental device in Timmy's parents' laboratory and start watching the cartoon Dino Saurs on a big screen. A vortex erupts from the device and pulls the three friends through the screen into the show's universe. They realize they are no longer in their world as the lab equipment hums behind them.

They crash into a building in Saur City and meet Forry, a Rhamphorhynchus who has lost his ability to fly. Forry explains he knows this world and offers to guide the newcomers. The kids sense they must adapt quickly or risk being trapped forever.

A group of cavepeople called the Rockies intrudes the building, working for the tyrannical Allosaurus Mr. Big. They steal a fuse from the lava tank cooling system, threatening a catastrophe that could destroy Saur City. The kids realize the fuse might also be needed to reopen a portal back home.

With Forry's knowledge, the group traverses a dinosaur graveyard and moves toward Tar Town. The journey tests their resolve and builds the team's trust as they navigate unfamiliar terrain. Forry proves a valuable guide through this alien world.

In Tar Town they enter a bar and meet Rex, a Tyrannosaurus, and Tops, a Triceratops. The two heroes initially refuse to help the newcomers, skeptical of outsiders. After the kids join them in fending off the Rockies, Rex and Tops change their minds and join the mission.

The group rests at Forry's tree house, where Timmy muses about alternate worlds and the possibility that stories might exist elsewhere. Timmy hints he might not want to return home because the real world is dull. Meanwhile, romantic feelings begin to blossom between Mick and Jamie, adding personal stakes to the quest.

Rex takes Timmy to a nearby island and reveals that his father betrayed Saur City by surrendering it to Mr. Big. The revelation deepens the conflict and explains the regime's power. The duo's bond grows as they share a difficult history.

Back at the tree house, the Rockies attack the group. Timmy discovers he can pause and rewind the Rockies using a remote from his lab, a power that could turn the tide. Mr. Big orders the Rockies to seize the remote, heightening the danger for the children.

The Rockies capture Timmy and take the remote, heading to Mr. Big's tower to deliver it and secure the control it offers. The team must mount a rescue mission to save their friend and stop the tyrant's plans. The stakes are raised as the power of the remote falls into the wrong hands.

Mick, Jamie, Rex, Tops, and Forry sneak into the tower's dungeon and free Rex's imprisoned father. He reveals that Mr. Big used a mind-control potion to force surrender and suppress dissent. The information confirms the depth of Mr. Big's manipulation and danger.

In a tense confrontation, Rex faces Mr. Big as he interrogates Timmy. The heroes fight to rescue Timmy and reclaim the remote. Timmy ultimately zaps Mr. Big with the remote, causing the tyrant to disappear in a burst of power.

With the tower's power compromised, the group begins to escape via the elevator powered by the fuse. Forry stays behind, using his flying ability to retrieve the fuse and ensure the elevator's operation for the others. The escape is harrowing but successful as they leave the collapsing tower behind.

As the team makes a precarious exit, Rex's father sacrifices himself to destroy the tower, buying time for the others to slip away. His sacrifice marks a turning point in the fight against Mr. Big's regime. The group honors the fallen ally as they push toward safety.

The group makes their way to the lava tank complex and reattaches the fuse, restoring the cooling system's function. Timmy uses the remote to reopen the portal, preparing to return to their world. The portal's activation creates a beacon of hope for a return home.

Reluctant but hopeful, the kids return to their universe just before Timmy's parents arrive back from their conference. They bring Timmy's parents into the lab to show them what happened, and then the device emits a final activation sound, hinting at new adventures to come. The friends are left with the memory of their extraordinary journey.