The Master, in the guise of Professor Thascalos, has constructed at the Newton Institute in Wootton a device known as TOMTIT - Transmission Of Matter Through Interstitial Time - to gain control over Kronos, a creature from outside time. The creature is summoned but proves to be uncontrollable.

When scientists start to go missing in the 20th century, the Doctor is called in by the Brigadier to investigate. His investigations lead him to deduce that they are being kidnapped through time and he sets off in pursuit, unknowingly kidnapping journalist Sarah Jane Smith in the process. Arriving in the middle ages, the Doctor and Sarah find themselves caught up in the machinations of the robber baron Irongron and his man from the stars. The alien, a Sontaran named Linx, is arming him with modern weapons in return for helping him repair his damaged ship, and it's up to the Doctor and Sarah to stop him from ruining the Earth's timeline.

In England, 1066, the Doctor confronts a mysterious Monk who is attempting to change history.

The Doctor returns to Peladon fifty years after his last visit, to find Queen Thalira, daughter of the late King Peladon, on the throne. A tense labour dispute between Pel nobility and miners is worsened when apparitions of their deity Aggedor attack and kill several miners. The Galactic Federation desperately needs trisilicate for its war against Galaxy 5 and sends in brutal Ice Warrior troopers to ensure production. The Doctor discovers a devious plot at the heart of Aggedor's appearances.

The Doctor and his companion Evelyn investigate a series of mysterious disappearances on the planet Chronos and once again encounter the dangerous Cybermen.

The Doctor returns to Gallifrey, claims his rights and is inaugurated President. It soon turns out that he has led a group of aliens called Vardans to the planet to eradicate them completely. After they are destroyed, the Sontarans take their opportunity and follow them in their invasion until they are destroyed by the Doctor.

The Rani has returned with another malicious scientific scheme. Taking advantage of the post-regenerative trauma the recently regenerated and unstable Doctor is going through, she hopes to achieve control of an approaching asteroid composed entirely of strange matter. Can the Doctor figure out he is being used for the Rani's evil experiment, and what is behind the door the Rani won't allow him past?

The Doctor finally faces his destiny as both his home planet and old foe reappears.

To coincide with a new era for Doctor Who we take a nostalgic look back at the glory days of the programme in a tribute to its unsigned heroes. Ever wondered what it’s like inside a Dalek? How, exactly, of you portray a Fish Person? What was it like recording Doctor Who during its 26 year run? And just how do you get to be a Doctor Who monster? Now you can find out as, for the very first time, we speak to the men and women who ensured we spend out Saturday nights behind the sofa. Their stories are funny, moving, unbelievable and sometimes tragic. Presented by the seventh Doctor, Sylvester McCoy, and containing unique film and newly discovered photographs, this all adds up to an entertaining trip down memory lane – go on treat yourself to a slice of nostalgia!

While investigating a vanishing Concorde at Heathrow Airport, the Doctor and his companions are thrown millions of years back in time, when a mysterious alien called Kalid is trying to control the ancient powers of the Xeraphin.