Series 10: Deimos

Millions of years ago, the noble Ice Warriors fled to Deimos, moon of Mars, hoping to sit out the radioactive death throes of their home planet. When the TARDIS lands on Deimos, the Doctor discovers that the Warriors' ancient catacombs are now a popular stop for space tourists. But the Martian dynasties are more than history, and the Warriors are far from extinct. It's not for nothing that 'Deimos' is the ancient word for 'dread'… Starring Paul McGann.

Series 10: The Book of Kells

'Anyone who's prepared to kill for a book interests me.' Ireland, 1006. Strange things have been happening at the isolated Abbey of Kells: disembodied voices, unexplained disappearances, sudden death. The monks whisper of imps and demons. Could the Lord of the Dead himself be stalking these hallowed cloisters? The Doctor and his companion find themselves in the midst of a medieval mystery. Starring Paul McGann and Niky Wardley with Jim Carter, Terrence Hardiman and Graeme Garden.

Series 10: Nevermore

A bizarre manifestation in the Control Room forces the TARDIS onto the Plutonian shores of the irradiated world Nevermore, whose sole inhabitant is the war criminal Morella Wendigo – a prisoner of this devastated planet. But the Doctor and his new companion aren’t Morella’s only visitors. Senior Prosecutor Uglosi fears the arrival of an assassin, after the blood of his prize prisoner. An assassin with claws… Starring Paul McGann and Niky Wardley with Fenella Woolgar, Michael J Shannon and Emilia Fox.

Series 10: Situation Vacant

TRAVELLER IN TIME AND SPACE seeks male or female companion with good sense of humour for adventures in the Fourth and Fifth Dimensions. No experience necessary. No time wasters, no space wasters please. Starring Paul McGann, James Bachman, Shelley Conn, Joe Thomas and Niky Wardley.

Lucie Miller

Lucie's first appearance is Blood of the Daleks. Described as a "strong willed northern lass," Lucie is initially an unwilling passenger in the TARDIS, having seemingly been placed with the Doctor as part of a Time Lord witness protection programme. Lucie tells the Doctor that the Time Lords have placed her in his care because she has seen something important, but doesn't know what. Her initial attitude towards the Doctor is disdainful, but she recognizes that he's "about saving worlds".

In Horror of Glam Rock, Lucie unexpectedly encounters her 'Auntie Pat', Patricia Ryder, the drummer of a failed band called Methylated Spirits, in 1974. As this is over a decade before Lucie is born, Pat is sceptical, but grows to like her as the story develops.

After several more adventures with the Doctor, the events of Human Resources reveal much of the mystery surrounding Lucie: the Time Lords learned that the Celestial Intervention Agency have been tracking Lucie because they believe she would become a terrible future dictator within Europe, and attempt to alter her present to prevent this. But when she applies for a job in an office building, which is part of another CIA plot, the Time Lords place her with the Doctor to protect her from the effects of exposure to too much CIA technology. But in reality, a woman named Karen, who had been interviewed on the same day as Lucie, is the actual future dictator, and the Time Lords have either been tricked or simply made a mistake. At the end of the story Lucie and the Doctor continue to travel together in the TARDIS.

Lucie meets her Aunty Pat again in The Zygon Who Fell to Earth, set about a decade after Glam Rock. Pat has now married a Zygon who has rejected the warrior ways of his people. But when his superiors come looking for him, Pat is murdered. Her husband, unwilling to tell Lucie, permanently takes on Pat's form, becoming the Aunty Pat that Lucie grew up knowing. The Doctor finds out about this, but is sworn to secrecy.

At the end of Vengeance of Morbius, the Doctor is seemingly killed while trying to prevent the Time Lords from being overthrown. They send her home and she resumes her normal life. However, six months later, she is kidnapped by The Headhunter, who has taken the Doctor's abandoned TARDIS, and together they locate him on an obscure water planet called Orbis, where he has been quietly living for the last 600 years of his life. Orbis is then suddenly destroyed and the Doctor and Lucie resume traveling in the TARDIS.

Finally, in Death in Blackpool, Lucie discovers the truth about her Aunty Pat being a Zygon. She also learns that the Doctor knew and didn't tell her. She sees this as a betrayal of their trust and chooses to stay home, parting ways with the Doctor.

C'rizz

C'rizz (pronounced as "Keh-riz") first appears in the play The Creed of the Kromon (2004), encountering the Doctor and Charley when they entered the Eutermes zone on Bortresoye. The Doctor had been exiled to Bortresoye's universe from his own, and had also been deprived of his TARDIS. In addition, a sinister entity known as the Kro'ka has been sending the Doctor and Charley across the various zones that Bortresoye was divided into for reasons that, at the time, were still unexplained. The Eutermesans are a race of reptilian humanoids, exoskeletal, with vestigial bone structures on their heads. They also have the ability to change their skin colour, blending, like chameleons, with their surroundings. The Eutermesans are the slave force of another race, the termite-like Kromon, and are mostly farmers.

When C'rizz meets the Doctor and Charley, he is suffering grief from the loss of his mate, L'da, whom he had left behind when he escaped the Kromon biodome. Together with the Doctor and Charley, he returns to rescue L'da and free his people from the Kromon. He succeeds in the latter, but is forced to kill L'da, who had been transformed into a Kromon queen. Still coming to terms with what he had to do, he asks to join the Doctor and Charley as they proceeded to the next zone in search of the TARDIS and the answer to the mysteries of the universe they were in.

Eventually, it is revealed that C'rizz was an adept of the Church of the Foundation, which believed that all things must die, and had murdered in its name before he met L'da and left the Church. It is also revealed that the Eutermesans are more than physical chameleons, but emotional and mental ones as well, shaping their personalities to those around them but also making them easily manipulated.

When the Doctor and Charley finally manage to return to their own universe, C'rizz continues to travel with them, as he trusts the Doctor to keep him stable and himself. They emerge on an Earth conquered by the Daleks, who try unsuccessfully to brainwash C'rizz into becoming their new Emperor. The Dalek attempt adds to C'rizz's deteriorating mental state: in Terror Firma he continues to hear, in his mind, the voices of the people he killed.

In Absolution, C'rizz is granted massive psychic powers on a planet that resembles Hell with citizens who have been turned to demons save one domed city, eventually transforming into a physical form that Charley likens to Lucifer. The Doctor theorizes that the Eutermesans genetically engineered C'rizz to house their souls in some mad bid for immortality. C'rizz eventually gives up his new form and powers by restoring the planet and its citizens back to their original forms. This action exhausts C'rizz, who then thanks the Doctor for healing his emotional wounds (save for L'da's death) and calls Charley his sister before dying, his body turning to ashes.

The impact of C'rizz's death is further felt in The Girl Who Never Was.

Charley Pollard

Charlotte Elspeth Pollard, or simply Charley was born on April 15, 1912, the day the Titanic sank, and first appears in the play Storm Warning (2001). Storm takes place in 1930, making her 18 years old at the time.

She is born into a well-to-do family; her mother is Lady Louisa Pollard and two sisters, Margaret and Cecelia, are mentioned. Charley and her siblings grow up in a manor house in Hampshire, looked after by servants. However, Charley rebels against this existence and, styling herself an Edwardian adventuress, runs away from home seeking excitement. Making an appointment to meet a young man in Singapore on New Year's Day 1931, she stows away on board the Airship R101 disguised as a male member of the crew. There, she meets the Doctor and together they discover the secret mission the airship is on. At the conclusion of the story, she is rescued from the fated crash of the R101 by the Doctor and taken on board the TARDIS as his newest companion.

There are consequences to the Doctor taking Charley on board, however. According to history, Charley was supposed to die in the R101 crash and the Doctor's rescue of her causes a temporal paradox. After a while, the Web of Time begins to break down as anachronisms seep into history and "anti-time" starts to infect the universe, with Charley as both focus and gateway. The Time Lords of Gallifrey take notice, and Lord President Romana gives orders to arrest Charley and the Doctor. Charley is willing to sacrifice herself to save the universe, but the Doctor is unable to sacrifice her, taking the forces of anti-time into himself instead. History is then altered so that the paradox of Charley's continued existence became part of established history — in other words, the paradox and the resulting consequences, including the change in the timeline, were supposed to happen.

However, having absorbed anti-time, the Doctor now is a danger to the universe, and so has to exile himself into a parallel universe where time does not exist. He intended to do so alone, but Charley stows away aboard the TARDIS and follows him into exile. Eventually, the Doctor discovers he is free of the anti-time infection and he and Charley manage to find their way back, accompanied by C'rizz, a native of that other universe.

It is the later death of C'rizz that prompts her decision to leave the TARDIS. She quickly changes her mind, but due to a series of events involving Cybermen, temporal shifts and memory loss, parts company with the Doctor. While he believes she has voluntarily left him, Charley actually ends up marooned on an island in the year 500002, believing that the Doctor had died in their confrontation with the Cybermen. She builds a makeshift crystal telegraph and sends an SOS repeatedly into space, hoping that anyone, particularly the Doctor, would rescue her. When her message is finally answered, it turned out to be the Sixth Doctor who saves her. Charley chose to continue traveling with this earlier incarnation, keeping the circumstances of her past and his future a secret from him. This leads the Doctor to grow suspicious of her secrecy and poorly devised lies.

Eventually she runs afoul of a secret TARDIS inhabitant named Mila, who swaps places with her. Charley is infected with a virus rendering her invisible and non-corporeal while Mila pretends to be her. Of the dozens of companions Mila has secretly encountered, Charley is the only one she could infect, because she's the only companion the TARDIS refused to protect from infections. It is implied that the TARDIS hates Charley, because of her multiple temporal paradoxes. Charley is cured by the mysterious Viyrans and she spends years helping in their mission to rid the universe of certain viruses. Finally she finds the Sixth Doctor again, still traveling with Mila who is still pretending to be Charley. But Mila dies saving the Doctor's life and Charley takes the opportunity to finally set the Web of Time straight. She asks the Viyrans to alter the Doctor's memories so that all the adventures they shared would be remembered with Mila's name and true appearance. This way, years later, when the Eighth Doctor meets Charley, he'll believe it to be their first encounter. What happens to Charley after she leaves the Sixth Doctor is ambiguous, but it seems she continues to work for the Viyrans.

Charley's exuberant personality matched the Eighth Doctor's well. She embraced the wonders of the universe that travel with the Doctor showed her and helped the Doctor fight the evils he encountered with courage. She was not only loyal to the Doctor, but also developed romantic feelings for him and eventually confessed them. The Doctor was very fond of Charley, and admitted later that she was his friend and he loved her, but what that meant for a virtually immortal Time Lord was unclear, as the relationship between the two was not a physical one.