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Self-destruct was a type of ability installed in most robotic mechanisms. It could be used as a weapon or a failsafe. For many cyborgs and robots, initiation of the self-destruct mechanism was akin to suicide.

Kahler-Tek had a self-destruct mechanism, which he intended to use when he realised his only potential was as a war weapon, but the Eleventh Doctor convinced him otherwise. (TV: A Town Called Mercy)

The Cybermen created by Missy, the female incarnation of the Master, could self-destruct in such a manner that they unleashed clouds of Cyber-pollen, a liquid metal that would turn organic life into more of their kind. When this substance was released in the skies of Earth, the Twelfth Doctor turned control of the Cyberman army over to Danny Pink, himself partially upgraded, who ordered all the Cybermen to fly into the clouds and conventionally self-destruct, dispersing the clouds and ending the invasion. (TV: Death in Heaven)

Self extermination

A Dalek self-destructs. (TV: Dalek)

Daleks could also self-destruct, for various reasons. (TV: Remembrance of the Daleks, Dalek, Asylum of the Daleks, COMIC: Extermination of the Daleks) At the end of the Shoreditch Incident, the Supreme Dalek self-destructed when the Seventh Doctor revealed that Skaro was destroyed. (TV: Remembrance of the Daleks) Another Dalek, who believed it was the last of its kind, asked Rose Tyler to order it to self-destruct after it gained emotions from her. Preferring death to a life with emotions, this Dalek used the spherical protrusions from its lower body to form a force field, and to exterminate itself in the end. (TV: Dalek)

In the 22nd century, a group of Daleks on Earth initiated self-destruction after the Tenth Doctor used a proton cannon to make them intangible. (COMIC: Extermination of the Daleks)

When the Eleventh Doctor found himself in the Dalek Asylum, a damaged Dalek, deprived of its gunstick, attempted to use its self-destruct to kill him. Before it casing detonated, the Doctor managed to hack into its locomotion systems, sending the Dalek hurtling towards others of its kind, the resulting explosion destroying it and them. Despite bearing the casing utilized in the Last Great Time War, this Dalek's self-destruct lacked the forcefield and manifested itself merely as a large explosion, possibly due to its damaged state. (TV: Asylum of the Daleks)

In the 24th century of a parallel universe, Captain Jean-Luc Picard, formerly Locutus of Borg, and Lieutenant Commander Data were able to induce a Borg cube to self-destruct before it could begin the process of assimilation on Earth. (COMIC: Assimilation²)