|138||6T||Attack of the Cybermen||05 Jan 1985||2||All|
|139||6V||Vengeance on Varos||19 Jan 1985||2||All|
|140||6W||Mark of the Rani||02 Feb 1985||2||All|
|141||6X||The Two Doctors||16 Feb 1985||3||All|
|142||6Y||Timelash||09 Mar 1985||3||All|
|143||6Z||Revelation of the Daleks||23 Mar 1985||2||All|
Things become a little confused after this season, but Peri can probably be considered to have left as a regular companion at the end of this season.
Attack of the Cybermen
The Doctor and Peri answer a distress call which brings them to the Earth of 1986, shortly prior to the Doctor destroying Mondas, the original home of the Cybermen. The Cybermen have stolen a time machine and are intent on stopping the destruction of Mondas. The Doctor is surprised to find that the mercenary Litton is on Earth and apparently in league with the Cybermen.
Vengeance on Varos
The Doctor and Peri visit the mining planet of Varos, in order to pick up some Zyton-7, a rare compound needed by the TARDIS. The inhabitants of Varos enjoy watching criminals being publicly tortured and executed, and punish unpopular decisions by direct pain control of the Governor! The Doctor discovers that Sil, a small and obnoxious reptile from Galatron who is supposed to be negotiating a trading arrangement with the Governor, is in fact plotting to take over Varos to gain total control of the Zyton-7 supply!
Mark of the Rani
The Doctor visits the home of Robert Stephenson at the start of the industrial revolution, and discovers that he has called together a meeting of all the great minds of his time. The Doctor is alarmed to discover that the Master, and an evil female Time Lord known as the Rani are present and behind a series of vicious luddite attacks. But what is their real motive in being on Earth at this period in it's history?
The Two Doctors
The Doctor and Jamie are sent by the Time Lords to visit a scientific Think Tank in deep space they helped establish to protest about the dangerous time travel experiments being carried out there. It turns out to be a trap and the Doctor is caught. Later the (other) Doctor and Peri arrive to investigate the disappearance of the Doctor and Jamie, and are re-united with Jamie. Their investigations lead them to Earth where the Sontarans are backing a megalomaniac scientist's dangerous experiments into time travel and genetic engineering.
The Doctor and Peri are startled to a see the image of a girl fly through the TARDIS console room. They discover a time tunnel, and trace it back to the planet Karfel, where they find that a cruel tyrant, the Borad, throws his opponents into the time tunnel. The Doctor is forced by the Borad to retrieve the girl Vena, who fell into the time tunnel with a vital amulet, and finds that the far end of the tunnel is in 19th century Scotland! Bringing back Herbert, a young man on holiday in Scotland who enters the TARDIS accidentally, and Vena, the Doctor must return to Karfel to defeat the Borad, who is revealed to be a weird mutant!
Revelation of the Daleks
The Doctor and Peri arrive on Necros to attend the funeral of an old friend of the Doctor who has recently died. However, Tranquil Repose is not all it seems and an attempt is made on the Doctor's life. Soon the Doctor comes face to face with the Great Healer, only to discover it is none other than Davros, the creator of the Daleks, intent on rebuilding the Dalek race decimated by the Movellans.