The Mentors are a hostile species in the Doctor Who series, who were a recurring antagonist during the Sixth Doctor's era. They appeared in "Vengeance on Varos" and the "Mindwarp" segment of the "Trial of a Time Lord" season.


The Mentors were the aristocratic rulers of Thoros-Beta. Despite being physically weak to the point of being virtually immobile without assistance, they had gained dominance in the system, using the humanoid population of neighbouring Thoros-Alpha as a slave labour force. They viewed the universe in business terms, with acquisitions assessed on the basis of monetary gain.

The Doctor first encountered the Mentors on Varos, in the shape of their Galatron Mining Company. The Mentors' representative, Sil, was negotiating for the purchase of zeiton-7. Sil had convinced the population that zeiton had little value and was trying to force the price down. He used hard tactics with the planet's Governor, an office that had a high turnover since unpopular governors could be voted to death by the population, while bribing the permanent officials to sabotage any attempts at a fairer price. When the Doctor threatened to expose the truth, and attempts to have him killed failed, Sil called in an invasion force from Thoros-Beta. However, the discovery of zeiton traces elsewhere, meaning occupation of Varos would not give them a monopoly, resulted in the Mentors calling off the operation and resulting in Sil being ordered to pay whatever the Varosians asked.

Mentor Individual

An elderly Mentor

The Mentors continued their business dealings, provoking a war between the primitive peoples of Thardon and Krontep in order to sell them advanced weapons. They also employed a scientist, Crozier, to carry out genetic experimentation, creating slave creatures and also improving the Mentors themselves. As the result of this however, the Mentor leader Lord Kiv found his brain expanding to an extent that it no longer fitted in his skull, and required his brain to be transplanted into a new body to survive.

With the Krontep king Yrcanos proving unco-operative, the Mentors ordered Crozier to subject him to brainwashing to make him more compliant. The Doctor intervened but was subjected to the machine himself, leading him to ally himself with the Mentors for a time and assist Crozier. When his friend Peri was selected as Kiv's new host, with her personality set to be erased and replaced with his, the Doctor freed the Alphan slaves. The experiment was ended by an attack on Crozier's laboratory by Yrcanos and it is unclear how many of the Mentors survived his rampage.


  • During his initial appearance in "Vengeance on Varos", Sil's species goes unnamed, although his home planet of Thoros-Beta is mentioned. The name Mentors is not used until "Mindwarp".


           Doctor Who logo Villains

Davros | Dalek Emperor | Dalek Prime Minister | Supreme Dalek | Special Weapon Dalek | Dalek Time Controller | Dalek Antibodies | Rusty | Metaltron
Cult of Skaro: Dalek Sec | Dalek Caan

Cyber Controller | Cyber Planner | John Lumic | Yvonne Hartman | Mercy Hartigan | Tobias Vaughn | Packer | Cybermats | CyberKing

The Master
Classic Era | Revival Era ("Harold Saxon")

General Staal | Commander Skorr | Commander Kaagh | Linx | Styre | Stor | Stike | Varl | Luke Rattigan

Mummy | Vigil

Mr. Finch

Matron Cofelia

Clockwork Repair Droids
Half Face Man

The Gunslinger

Order of St. Agnes

Family of Blood

Great Intelligence
Whisper Men | Robot Yeti

Madame Kovarian

Slitheen Family
Jocrassa Fel-Fotch Passameer-Day Slitheen | Sip Fel-Fotch Passameer-Day Slitheen | Blon Fel-Fotch Passameer-Day Slitheen | Glune Fex Fize Sharlaveer-Slam Slitheen | Kist Magg Thek Lutiven-Day Slitheen | Korst Gogg Thek Lutiven-Day Slitheen | Dax Fex Fize Slitheen | Bloorm Vungah Bart Slitheen | Rahnius Slitheen | Asquith Slitheen | Chris Slitheen

Blathereen Family
Leef Apple Glyn Slitheen-Blathereen | Tree Lorn Acre Slitheen-Blathereen

Alaya | Restac | Morka | Icthar

Sea Devils
Chief Sea Devil | Sauvix

Time Lords
Rassilon | Borusa | Omega | The Rani | The Valeyard | The Meddling Monk | The War Chief | The Eleven

Bonnie | Broton

Androzani Major/Minor
Sharaz Jek | Morgus | Stotz | Jek's Androids | Smugglers

The Brethren
The Host | Father Angelo

Ice Warriors
Grand Marshal Skaldak | Lord Slaar | Lord Azaxyr | Sskel | Varga | Zondal

Sil | Lord Kiv

Lilith | Mother Doomfinger | Mother Bloodtide

Eric Stahlman | Harry Slocum | John Bromley | Private Wyatt

Nestene Consciousness | Channing | Mickey Auton

Republican Security Forces
John Benton

Robot Knights
Sheriff of Nottingham

Rosanna Calvierri | Francesco

Abaddon | Abzorbaloff | Adam Mitchell | Adam Smith | Adolf Hitler | Arcturus | Androvax | Animus | Anne Droid | Antibodies | Autons | Azal | Baltazar | Beast | Beep the Meep | Bert Walker | Black Guardian | Boneless | Bragen | Brynblaidd Cannibals | Captain Hardaker | Carrionites | Charles Grover | Charlie Duffy | Chessene | Childeric | Colonel Manton | Colony Sarff | Count Grendel | De Flores | Dream Lord | Ed Morgan | Eddie Connolly | The Editor | Empress of the Racnoss | Emojibots | Eugene Tacitus | Fairies | Fearmonger | Fendahl | Fenric | Futurekind | Ganymede Systems | Garvin | Gelth | General Finch | Gray | Harrison Chase | Hawthorne | Headless Monks | Heavenly Hosts | Helen A | Hetocumtek | Henry Van Statten | High Priest Clovis | Hinks | House | Ice Governess | Ilin | Jagrafess | Jocelyn Stevens | Joshua Naismith | Judoon | Julius Grayle | K1 Robot | Kal | Kandy Man | Kantrofarri | Karl | Kess | King Hydroflax | King Richard III | Klineman Halpen | Koquillion | Krasko | Kroagnon | Lady Cassandra | Lady Peinforte | Leandro | Lieutenant Koenig | Light | Livilla | Lord Sutcliffe | Lucius Petrus Dextrus | Maaga | Macra | Manish | Marshal of Solos | Matron Casp | Maurice Caven | Mavic Chen | Max Capricorn | Medusa | Meglos | Melanicus | Mestor | Midnight Entity | Minotaur | Mona Lisa | Monarch | Morax | Mr. Diagoras | Mr. Magpie | Mr. Seyton | Mr. Webber | Nephew | Nicholas Valentine | Ogrons | Oswald Danes | Peg Dolls | Pied Piper | Prisoner Zero | Professor Whitaker | Professor Zaroff | Ramón Salamander | Richard Lazarus | Richard Maynarde | Roboforms | Rutans | Shoal of the Winter Harmony | Seb | Sentris | Shockeye | Sisters of Plenitude | Dr. Skagra | Skovox Blitzer | Smilers | SniperBot | Solana | Solomon | Solomon's Robots | Sutekh | Sycoraxs | Tegana | The Child | The Figure | The Flood | The Foretold | The Hath | The Trickster | The Wire | Tia Karim | Time Beetle | Time Zombies | Toclafane | Tzim-Sha | Vespiform | Weeping Angels | Winifred Gillyflower | WOTAN | Yartek | Zagreus | Zephon | Zu-Zana |

Community content is available under CC-BY-SA unless otherwise noted.