The episode is widely praised for its shift into genuine horror, featuring claustrophobic corridors and the unsettling "red-eye" possession of the Ood.

David Tennant (The Doctor), Billie Piper (Rose Tyler), and Gabriel Woolf as the voice of the Beast.

Murray Gold , who crafted the episode's tense, industrial score.

The crew is assisted by the Ood , a telepathic slave race. However, a mysterious entity known as "The Beast" begins to telepathically possess the Ood, turning them into killers, and eventually possesses the crew member Toby Zed.

The TARDIS is lost when a section of the base collapses, leaving the Doctor and Rose stranded on a world that shouldn't exist. Key Highlights

This episode marks the first appearance of the Ood, who would go on to become one of the most iconic and complex recurring alien races in the series.

" The Impossible Planet " is the eighth episode of the second series of the revived , first airing in 2006. It serves as the opening half of a dark, two-part epic that pits the Tenth Doctor and Rose Tyler against an ancient, primordial evil. The Plot: A Sanctuary on the Brink