Ep 4. Downstream

The show Land of the Lost follows the adventures of the Marshall family - father Rick, son Will, and daughter Holly - as they get lost in a mysterious land full of prehistoric creatures and technology. Season 1 episode 4 is titled "Downstream" and takes place after the Marshalls have been living in this strange world for a few weeks.

The episode begins with the Marshalls exploring the nearby river in a makeshift raft. Along the way, they discover a waterfall and decide to explore it. They leave their raft behind and venture into a dark cave that leads to a hidden underground river.

As they float downstream, Will and Holly notice that the water is getting warmer and murkier. They soon realize that the river is flowing through a geothermal vent, and the heat is causing the water to boil. They try to turn back, but it's too late - their raft is sucked into an underground tunnel.

The tunnel leads them to a vast underground lake, surrounded by steam vents and hot springs. The Marshalls try to paddle to shore, but their raft is caught in a strong current and they're dragged to the center of the lake. There, they discover a huge steam-powered machine that controls the lake's water levels.

They explore the machine and find a control panel filled with buttons and levers. Holly accidentally presses a button, causing the machine to malfunction and release a tidal wave. The Marshalls manage to escape just in time and are swept downstream.

As they float down the river, they encounter a hostile tribe of primitive humans who live on the riverbanks. The tribe captures the Marshalls and takes them to their village, where they're tied up and left to rot.

Meanwhile, their raft floats downstream and is discovered by a group of Sleestaks - a reptilian humanoid species that the Marshalls have encountered before. The Sleestaks examine the raft and discover a map that Rick had been working on, showing the location of their Lost City home.

The Sleestaks follow the map and discover the Marshalls' home, where they begin to search for them. They find the Marshalls' notebooks and learn all about their habits and weaknesses. They plan to lure the Marshalls into a trap and capture them for experimentation.

Back at the tribe's village, the Marshalls manage to escape and flee downstream. They're pursued by the tribe and narrowly avoid being caught in a series of dangerous rapids. They finally make it back to their camp, where they discover that the Sleestaks have been there.

The episode ends with the Marshalls realizing how dangerous their situation has become, and they decide to take more precautions to protect themselves from the dangers of the land of the lost.

Overall, Land of the Lost Season 1 Episode 4 "Downstream" is a thrilling adventure that showcases the dangers of the mysterious land that the Marshalls have found themselves in. It features exciting encounters with prehistoric creatures, underground machines, hostile tribes, and reptilian humanoids. It also furthers the ongoing storyline of the Marshalls trying to find their way back home while facing constant peril. Fans of science fiction and adventure will love this episode and the entire series.