Leela defends herself and James Skinsale from the Rutan scout. (TV: Horror of Fang Rock)
A knife was a tool used for cutting or stabbing, which could also be used as a weapon. The earliest Earth knives were little more than sharpened rocks. (TV: An Unearthly Child)
A carnivorous flower caught the First Doctor on Tiro and almost digested him, but he escaped by hacking at the plant's insides with his knife. (PROSE: Terror on Tiro)
Leela used her knife to try to keep a Rutan scout away from her and James Skinsale in the Fang Rock lighthouse. (TV: Horror of Fang Rock)
The Fifth Doctor, stuck in the streets of Wallachia with Peri in 1462, was stabbed in the chest with a poisoned knife. (AUDIO: Son of the Dragon)
Shockeye killed Oscar Botcherby with a meat knife when he refused to accept the twenty narg note Shockeye offered as payment. (TV: The Two Doctors)
Major Raykal was murdered in Turkey by having his throat slashed open by an unknown killer with an non serrated knife. (PROSE: Eternity Weeps)
The Eighth Doctor tricked Elizabeth Kelly into stabbing him in the heart with a knife. This was so he could enter the realm of death and communicate with the spirit of Sebastian Chiltern. (PROSE: Camera Obscura)
When a chef on the Orient Express saw the Foretold, he grabbed a knife and waved it around to deter the mummy. (TV: Mummy on the Orient Express)
The Life Knife was a three-bladed knife that was associated with the resurrection gauntlet. Those killed with the knife were easier for the gauntlet to resurrect. (TV: Everything Changes, They Keep Killing Suzie)
A possessed Peter Russell about to stab Liz Shaw. (HOMEVID: The Zero Imperative)
A Gallifreyan Army knife was issued to the Chancellery Guard. The Doctor had one which was marked as property of Castellan Spandrell. (PROSE: Blood Harvest)
Leela once killed a Sontaran by expertly throwing a knife into the probic vent on the back of the Sontaran's neck. (TV: The Invasion of Time)
Possessed by the reservoir of evil, Daniel O'Kane used a knife on 13 August, 1945 to kill his mother, two sisters and, finally, his father Eustace. He would later use one whilst astral-projecting to kill Dr Colin Dove amongst others. Peter Russell attempted to use one to kill Liz Shaw whilst he was possessed, but Daniel jumped in the way in a moment of clarity and died. (HOMEVID: The Zero Imperative)
D.I. Burke was stabbed by Christian Purcell whilst attempting to subdue him to save Andrew Powell. (HOMEVID: The Devil of Winterborne)
According to the Thirteenth Doctor, "only idiots carr[ied] knives." (TV: The Woman Who Fell to Earth)