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Professor Taylor was a Welshman and one of UNIT's top scientific advisors. He had read all UNIT files on the Doctor, whom he idolised. He worked out how to close the wormhole created by the Swarm before the Doctor, who called him "brilliant" and his "new best friend". Captain Erisa Magambo ordered him to close the wormhole to protect the Earth, despite the Doctor and the passengers of Bus 200 being trapped on the other side. Outraged at the idea of abandoning the Doctor, Malcolm refused. Drawing her gun on him, Magambo again ordered him to close the wormhole. In spite of his fear, Malcolm refused again, surprising both of them. Once the Doctor and the passengers made their way through, the tense exchange ended. The Doctor called Malcolm to close the wormhole. In his excitement Malcolm repeatedly hung up on him, but nevertheless complied, closing the wormhole just ahead of the main swarm. (TV: Planet of the Dead)
After Malcolm met the Doctor for the first time in person, he hugged him and repeatedly proclaimed "I love you!" The Doctor, bemused, pointed to Malcolm affectionately as he walked away. (TV: Planet of the Dead)
Kate Stewart told Osgood to tell Malcolm to replace the batteries of the ravens of death. After being alerted to the presence of more than one Doctor in one place, Kate ordered Malcolm to send her one of her father's old files code-named "Cromer". (TV: The Day of the Doctor)
He headed the clean-up team which investigated the sight of Missy's apparent death (PROSE: The Secret Diary of the Master) at the hands of the temporarily-resurrected Alistair Gordon Lethbridge-Stewart. (TV: Death in Heaven) When his team discovered the Masterplan Journal, the Master's diary, he had its contents transcribed to a digital format and emailed them to Kate Stewart and the rest of UNIT Command. (PROSE: The Secret Diary of the Master)
Units of measurement
Professor Taylor made up his own units of measurements, including:
- Malcolms - One Malcolm was a wavelength parcel of ten KHz operating in four dimensions. He came up with the idea to name a form of measurement after himself from James Watt, saying "it didn't do [him] any harm."
- Bernards - One Bernard (named for the rocket scientist Bernard Quatermass) was one hundred Malcolms. However, he had yet to think of a unit of measurement going past five hundred Bernards. (TV: Planet of the Dead)