Fire extinguisher

Fire extinguishers were devices used to put out fires. In some situations they could also be used as makeshift weapons.

Common usage
The Doctor and his friends often used fire extinguishers to put out fires — not a few times on board the TARDIS herself.

Early evidence of fire extinguishers on board the TARDIS was seen when Nyssa had to contain the fire caused by her sonic destruction of the Terileptil android. A small model usable by a single hand was kept in a wicker basket just outside her bedroom. (TV: The Visitation)

The Eighth Doctor later used a fire extinguisher in the TARDIS library when a page from his copy of The Strand caught on fire, (PROSE: The Bodysnatchers) and the Tenth (TV: The Runaway Bride) and Eleventh Doctors (TV: The Angels Take Manhattan) sprayed an extinguisher into the console room after particularly rough landings.

The Third Doctor's UNIT laboratory was also equipped with fire extinguishers. Upon her first meeting with the Doctor, Jo Grant used one when she saw smoke emanating from one of the Doctor's experiments. The Doctor berated her for this as she had ruined his work. (TV: Terror of the Autons)

In the 41st century, Peri used a fire extinguisher on Zixlyr's ship. (AUDIO: The Bride of Peladon)

A Dalek on Survey Ship Sigma replaced it's arm with a fire extinguisher to put out the fire. (COMIC: The Dalek Project)

The Doctor invented a fire extinguisher which produced eighty times more foam than normal extinguishers. He used it to put out a fire from a Bunsen burner on the TARDIS console. (COMIC: Bad Vibrations)

As weapon
Fire extinguishers could be used more offensively, however.

The First Doctor, for instance, used a fire extinguisher against a dragon which lived in the forest outside the Pied Piper's castle. (COMIC: Challenge of the Piper)

Ben and Polly used adapted fire extinguishers to spray Cybermen with a chemical cocktail designed to kill them. (TV: The Moonbase)

On a parallel Earth, the Third Doctor, Greg Sutton and the Brigade Leader used fire extinguishers against the Primords. (TV: Inferno)

In San Francisco, the Eighth Doctor sprayed with a fire extinguisher, blinding him long enough for him and Grace Holloway to escape. (TV: Doctor Who)

The Ninth Doctor once found that members of the Slitheen family were briefly stunned by the chemicals in an ordinary British fire extinguisher. (TV: World War Three)

Clyde Langer and Rani Chandra used fire extinguishers to temporarily disable nanoforms. (TV: Prisoner of the Judoon)

On Világ, the Sixth Doctor and Justice Rossiter used fire extinguishers against hospital patients who had been given transfusions of Killoran DNA. (AUDIO: Thicker than Water) The Sixth Doctor used a fire extinguisher to break the window of a steam room to rescue Peri, who then used it to cool herself off. (AUDIO: Year of the Pig)

When one of the Umbra's tendrils caught Clara Oswald on board the Pollyanna, Sandy Tanaka used a fire extinguisher against it to make it release Clara. (COMIC: The Eye of Torment)

Other species were perhaps more susceptible to the effects of fire extinguishers. Clockwork Droids, (TV: The Girl in the Fireplace) Silurians, (TV: The Hungry Earth) and people like Harvey who had been converted into a Dalek puppet by the nanocloud (TV: Asylum of the Daleks) could all be rendered inactive for several hours by the use of an ordinary fire extinguisher.

Sometimes, however, fire extinguishers proved ineffective weapons. Sarah Jane Smith first sprayed Odd Bob the Clown with a fire extinguisher, then hit him with it, but neither action had any effect. (TV: The Day of the Clown)

In some situations, extinguishers were used more as projectiles – objects to be simply lobbed at a problem. When Brian Hughes locked the doors of the Pinehill Crest Hotel, for instance, Ace tried throwing a fire extinguisher to break them, only to find that they were made of safety glass. (AUDIO: The Shadow of the Scourge)