The Doctor and his friends take refuge in the TARDIS but find themselves pursued by Stor and Kelner.

The Doctor and his friends flee from the Sontarans and the Doctor tries to convince Borusa to abandon his sacred office in order to help defeat them.

The Doctor convinces Andred to trust him as he works to expel the Vardans, while Leela gathers the Outsiders for an attack on the Capitol.

The Doctor allows the Vardans to occupy Gallifrey while Leela and Rodan head out into the wasteland to search for help.

The Doctor orders Leela exiled from the Capitol, then orders K9 to sabotage Gallifrey's defences.

The Doctor returns to Gallifrey to become the President of the High Council of Time Lords. But Leela realizes that the Doctor is acting out of character.

With the Trog revolt close to success, the Oracle grants the Minyos travelers what they seek (the long lost race bank) in hopes they'll depart peacefully and straight away, but the Doctor suspects it's not all going to be as amicable as that. And what to do about the Trogs?

Capturing the Doctor and Leela, the citadel guards are quite pleased to have more subjects for their public executions, but it only fires up a Trog revolt instead.

Crashing inside a newly formed planet, the Doctor and others find it inhabited by a slave labor mining society, where rocks are harvested for their radioactive energy and human life has little value. With a population controlled by deliberate cave-ins, poison gas, and periodic sacrifices to an Oracle, the miners, called Trogs, are also descendants from Minyos, and who desperately desire freedom.

Materializing at the edge of the cosmos, the frontier of creation, The Doctor, Leela & K-9 encounter four ancient space travelers from Minyos, the first race ever contacted by the Time Lords. All but extinct due to their Time Lords encounter, the Minyans (rejuvenated 1000 times each) have been embarked on a long 100,000 year old quest, searching the universe for the lost race bank of their species to take to a new home world. But their equally old ship is finally failing, succumbing to the gravitational pull of a newly forming sun and taking the Doctor and his party with it.

Attempting to start a successful revolution, the Doctor uses Pluto's Public Address System to announce successful revolution, all the while trying to determine the Collector's true species and why he, or it, seems set on taxing the life out of humans.

The merciless Collector, who runs The Company, issues a bounty on the Doctor for his capture, while an already captured Leela is sentenced to public execution, via a steamer, for crimes against the company.

Captured by the authorities, the Doctor finds himself restrained in a Correction Centre where he's to be prepped for painful shock treatments, making him unable to return within a given time frame to the underground rebels holding Leela, who are prepared to kill her as promised.

The Tardis lands on Pluto in the far future. Instead of being a lifeless rock, there's scented air, massive buildings, six suns, a human population subjugated by crippling taxes from a government called "The Company," and a man about to commit suicide.

With one of the archaeologists transformed and a massive implosion threatening, the Fendahl and its Fendahleen components start coming into existence while the Doctor, Leela and the Tylers do what they can to stop it.

The Doctor endeavors to prevent the re-existence of a Fendahl, a group entity that feeds on life itself and thought only to exist in Time Lord mythology, but a witches' coven, seeking power, intervenes.

Every time the archaeologists explore the ancient skull, something deadly hunts and haunts the wood while one of the researchers is particularly affected.

Archeologists near a reputedly haunted woods use a time scanner to explore the history of a sinister 12 million year old skull, creating a hole in time that attracts the Doctor's attention.

In trying to retrieve the clones from inside the Doctor, the alien virus is brought from the microbial world into the macro-world, and it's ready to spawn.

The medical center mounts a defense against alien forces trying to take the comatose Doctor while clones of Leela and the Doctor go microscopic so they can hunt down the intelligent infection that's in his head.

The Doctor draws into himself, fighting the voice in his own head that's trying to take over his intelligence.

"Contact has been made!" A relief crew en route to Titan in 5000 AD unwarily pick up hitchhikers that change them. Shortly thereafter the Doctor, passing through the same point in space, is hitchhiked as well, but not Leela - a reject who must die.

With little to fear, and its mother ship about to land and turn Earth into an alien attack base, the electrically charged Rutan scout drops its human guise and attacks openly.

A death scream is heard, yet all are accounted for. Eventually the Doctor finds a body stashed away but hours old, with rigor mortis already settling in, which means there's a chameleon in their midst. Completely cut off from the rest of the world and with an escalating body count, the Doctor wonders just what, exactly, he's locked inside the lighthouse with them all.

With inexplicable electrical problems keeping the lighthouse from maintaining a steady beam, a foolhardy ship crashes against the island rocks. Four shaken and discontent survivors join the people inside where the Doctor surmises they're all being carefully scrutinized, a prelude to an attack.

The TARDIS lands near an isolated rocky island lighthouse just after a comet strikes the nearby sea and a sudden chilling fog rolls in. Soon after, electrical problems take hold of the generator and one of the keepers dies mysteriously. Rueben, the eldest keeper, thinks it's the return of the legendary Beast of Fang Rock, but the Doctor suspects it's something worse that a legend.