Ep 1. Planet of Giants (1)

In the season 2 premiere of Doctor Who, titled "Planet of Giants," the Doctor (portrayed by William Hartnell), Ian (William Russell), Barbara (Jacqueline Hill), and Susan (Carole Ann Ford) find themselves miniaturized after a mishap with the TARDIS console. They end up stranded in a garden and soon realize that they are on Earth, but that everything around them is enormous.

As they try to figure out how to reverse the effects of the TARDIS and return to their normal size, they stumble upon a lethal insecticide being developed by a powerful chemical company. The Doctor and his companions must navigate their tiny environment and find a way to stop the company's dangerous experiment before it's too late.

The episode highlights themes of environmentalism and corporate greed, as the Doctor and his friends work against the clock to prevent a catastrophe on a small scale that could have devastating effects on a larger one. Additionally, the unique perspective of the characters as they navigate their miniature surroundings adds an exciting element to the episode's storytelling.