Server robot

You may be looking for the computer component.

The Server robots were a race of robots constructed by the Master during his time as "the Inventor" of Destination. They served as his emissaries in the city and proxies via which to stoke a war between the Citizens and Dalmari. Despite their innocuous appearance, they possessed formidable offensive capabilities.

Following the arrival of the First Doctor and his companions on the planet in Space Year 2003, the Master jumped them all forward twelve years as the war began. Though a peace talk was held in the interim, the servers sabotaged the conference, ensuring the conflict continued. When the Master returned in Space Year 2015, he blackmailed the Doctor for his TARDIS, flying off in it.

Without the Master, the server robots were left directionless allowing the Doctor to hack into them and use them as his own emissaries to force peace talks and help the planet rebuild until he left in Space Year 2017 when his TARDIS was returned to him. (AUDIO: The Destination Wars)