Several investors visit Melanie Bush to propose business ventures, and a mysterious old friend returns....

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The episode is a found footage video engineered and narrated by Gagan Rassmussen, a crew member of a space station orbiting Neptune in the 38th century. He manufactures a perilous adventure involving Sandmen - humanoid creatures made of rheum…

Television documentary filmed at a Doctor Who convention, including interviews with directors, writers and actors.

UNIT is providing security cover at an experimental drilling project at Eastchester, designed to penetrate the Earth's crust and release a previously untapped source of energy. Soon, however, the drill head starts to leak an oily green liquid that transforms those who touch it into vicious primeval creatures with a craving for heat. The Doctor is accidentally transported "sideways in time" by the partially repaired TARDIS control console into a parallel universe where the drilling project is at a more advanced stage. Thwarted by his friends' ruthless alter egos, he works to save both universes.

Where the Fourth Doctor left off, the Eighth Doctor comes to finish the job. With Romana and K9 by his side, they have to stop the evil Skagra. A remounted version of the abandoned Fourth Doctor serial, rewritten to feature the Eighth Doctor and fit in with the Big Finish audio drama continuity.

After an encounter with the Master, an airline stewardess named Tegan Jovanka becomes an unwitting stowaway aboard the TARDIS as it travels to the planet Logopolis. There, the Doctor discovers that the Master's interference with the Logopolitans' advanced mathematics has unleashed a wave of entropy which threatens to consume the entire universe.

On Deva Loka, a sylvan paradise planet with no predators, diseases or civilized roadways, Nyssa (due to Monarch's two attempts to turn her into an android) stays in the TARDIS to fully recover from mild mental disorientation, under the Doctor's Delta Wave Augmenter while the others go exploring. The Doctor and Adric find a survey team assessing the planet for colonization, and cracking under the stress of three fellow members (half the crew) disappearing without a trace. There's also a primitive and almost entirely speechless native culture on hand who curiously have about them a few items of technically advanced skill and knowledge. Meanwhile Tegan succumbs to a dreaming tree where an evil entity awaits a catalyst for entering the real world.

"Frontios buries its own dead", or so the saying goes. The Doctor, Turlough and Tegan are forced into landing on the remote planet of Frontios, a human colony where deaths go unaccounted for. What lies beneath the surface, dragging its victims down?