* in Doctor Who's first series after its revival, episodes 4-5 and 11 featured the alien Slitheen family of the planet Raxicoricofallapatorius, which were said to be Calcium-based life forms, causing them to be blown up in contact with vinegar.

Before sealing off the rooms, the Doctor confronts the Slitheen and learns that they are a family rather than a race, and they are not invading Earth, but rather raiding it for some commercial purpose.

As well as a reappearance in the episodes " Boom Town ", and " Attack of the Graske " the Slitheen also return in the BBC books The Monsters Inside along with another family of the same race, called the Blathereen, and The Slitheen Excursion.

However, he assists the pair in defeating the Slitheen, a family of extraterrestrial criminals ; using his computer hacking skills, he commandeers a military harpoon missile which he targets at 10 Downing Street to kill the Slitheen.

The Slitheen are a family of massive, bipedal extraterrestrials from the British science fiction television series Doctor Who and are adversaries of the Doctor.

Though the name " Slitheen " refers to a specific family, the term has been used by the Doctor and Rose to refer to the Raxacoricofallapatorian race in general.

Members of the Slitheen family have green skin, though there is variation in the skin tone of other Raxacoricofallapatorian families.

They were under the command of Korst from Revenge of the Slitheen, who planned to avenge the deaths of his family.

When the Ninth Doctor and Rose are arrested in the Justicia System in the year 2501, the Doctor shares a cell with Dram Fel-Fotch and Ecktosca Fel-Fotch Happen-Bar Slitheen, who claim that after the Earth incident, the remnants of the family went bankrupt and had become historians.

The Slitheen had not actually given up business, and were in conflict with a more influential family, the Blathereen.

An episode focusing on the Slitheen shows a family tree which makes reference to a number of other related families, all with the suffix ,-een, with the exception of the " Absorbalovian Rebels ", referring to the Absorbaloff from " Love & Monsters ", from the twin planet of Clom.

Additional hyphenated forms in Slitheen names suggest family sub-units within the broader Slitheen family.

Rose mentions that she and the Doctor have been to the Glass Pyramid of Sancleen, and to Justicia, which is the star system that they visit in the New Series Adventures novel The Monsters Inside by Stephen Cole ( where they encounter other members of the Slitheen family, as well as other members of the same race, the Blathereen ).

In the episode " World War Three " we find out that the Slitheen family from Raxacoricofallapatorius uses a Slipstream drive as a form of travel.

They also appear in The Sarah Jane Adventures episodes " Revenge of the Slitheen ", " The Lost Boy " and " From Raxacoricofallapatorius with Love ".

The Slitheen space ship from " Aliens of London " was also seen in a flashback in the same episode.

The Slitheen are also briefly referenced by The Doctor in the same novel while speaking to a member of the Cynrog about hiding under human-like skinsuits.

" A Fact File book about the Slitheen has also been released.

The bragging match between Sarah and Rose also references other stories: Sarah has met the Daleks, " lots of robots ", anti-matter monsters, mummies, dinosaurs, and the Loch Ness Monster, whereas Rose has met ghosts, " Slitheen in Downing Street ", the Dalek Emperor, gas-masked zombies, and a werewolf.

In Doctor Who and the Sarah Jane Adventures, the Slitheen disguise themselves in human skin suits to infiltrate human society.

He featured as a Slitheen in a Sarah Jane Adventures episode for Red Nose Day 2009.

Lachele Carl, the American reporter, reappears as a reporter in " World War Three ", " The Christmas Invasion ", " The Sound of Drums ", " The Poison Sky ", " Turn Left ", " The Stolen Earth " and the Sarah Jane Adventures stories Revenge of the Slitheen and Secrets of the Stars.

She is later seen in " The Christmas Invasion ", " The Sound of Drums ", " The Poison Sky ", " Turn Left ", " The Stolen Earth " and the Sarah Jane Adventures story Revenge of the Slitheen.

Another shorter adult Slitheen appeared in the 2009 From Raxacoricofallapatorius with Love, masquerading as a galactic diplomat in an attempt to steal Sarah Jane's robot dog K-9.

The Blathereen were mentioned again in the Sarah Jane adventures episode Revenge of the Slitheen.

*" Revenge of the Slitheen " ( The Sarah Jane Adventures ) by Rupert Laight

In The Sarah Jane Adventures story, Revenge of the Slitheen:

The phrase " Slitheen in Downing Street " was later used in Revenge of the Slitheen by Sarah.

The Slitheen appeared in the New Series Adventures novel The Monsters Inside by Stephen Cole.

*" The Slitheen Excursion " ( New Series Adventures ) by Simon Guerrier

Also, in the new Doctor Who series, Blon de Slitheen survives the bombing of 10 Downing Street ( Series 1, Episode 5: " World War Three ") by teleportation to the Isle of Dogs ( Series 1, Episode 11: " Boom Town ").

In the 2006 series episode " Love & Monsters ", an alien called the Abzorbaloff, whose natural form is similar to that of the Slitheen, claims to be from Raxacoricofallapatorius ' twin planet Clom.

She played the recurring villain Blon Fel-Fotch Pasameer-Day Slitheen a. k. a. " Margaret Blaine " in the 2005 series of Doctor Who.

On television, he has played Baraquel, Sariel and Araquiel in Sky One's Hex season 2, as well as a number of characters in the 2005 series of Doctor Who: Blon Fel-Fotch Passameer-Day Slitheen in " Aliens of London " and " World War Three " ( and briefly in " Boom Town "), lead Auton in " Rose ", the Anne Droid in " Bad Wolf " and " The Parting of the Ways ", Trine-E in " Bad Wolf ", and Lute of the Forest of Cheem in " The End of the World ".

The museum's display items feature the arm of a Slitheen ( Raxacoricofallapatorian ) from " Aliens of London ", which Rose recognises, and something that the Doctor refers to as " An old friend, well, enemy ... " – a Cyberman head ( from Revenge of the Cybermen, but the label on its display case references The Invasion ).

In " Boom Town ", Mickey later meets up with the Doctor, Rose and new companion Captain Jack ( John Barrowman ) in Cardiff, where he helps them foil a Slitheen plot.

Two of the remaining Slitheen were killed, and the others escaped, including Korst the first child Slitheen to appear, who later returned.

In the later novel, The Last Dodo, when the Doctor is asked if he's ever had a dream, he claims to have a recurring one in which a Slitheen on a rocking horse chases him.

In " World War Three ", when confronted by a group of Slitheen, the Doctor threatens to " triplicate the flammability " of a bottle of port wine with the sonic screwdriver, though one of the Slitheen realises he is bluffing.

The Autons returned in the 2010 episode, " The Pandorica Opens ", allying with the Atraxi, Blowfish, Chelonians, Daleks, Drahvin, Draconians, Sontarans, Cybermen, Haemogoth, Judoon, Slitheen, Silurians, Sycorax, Terileptils, Hoix, Roboforms, Uvodni, Zygons and Weevils to trap the Eleventh Doctor.

As the Doctor, Rose Tyler and their new friend Harriet Jones battle the murderous Slitheen while trapped in 10 Downing Street, the Doctor realises that the fate of the Earth rests on Rose's boyfriend, Mickey.

Following from the cliffhanger in " Aliens of London ", The Doctor being an alien allows him to survive the electrical pulse administered by the Slitheen Green, while Mickey Smith is able to push aside the police inspector who was advancing on Jackie Tyler.

The Doctor attempts to get the police, but by the time he has returned, the Slitheen have got back into their suits.

The Doctor gives Mickey instructions on how to log into the UNIT website on his computer, and uses that to determine that the Slitheen ship is presently in the North Sea, transmitting some signal that Mickey attempts to decode.

The Doctor realizes that the Slitheen actually plan to fire the weapons against other countries in order to start World War III so they can sell the Earth's radioactive remains as a fuel source, which they have already begun advertising through the signal Mickey has decoded.

Complying, the Doctor helps Mickey to hack online into the controls of the Royal Navy HMS Taurean, a Trafalgar class submarine, to fire a non-nuclear missile at 10 Downing Street, where all the Slitheen conspirators are now gathered.

Before the Slitheen could receive the launch codes, the Ninth Doctor arranged for a Harpoon missile to demolish 10 Downing Street, ending the scheme and killing all but one of them who managed to escape through an emergency teleport.

When the Doctor and Rose defeat an attempted Blathereen takeover of the system, the Slitheen are pleased to see they can once again become the profit-holders of their race.

Rose mentioned the Slitheen Parliament of Raxacoricofallapatorius in " The Christmas Invasion " ( though her impromptu speech was a pastiche of phrases she's picked up on her travels with the Doctor ).