Cloaked figure (Prisoners of Time)

The cloaked figure was an individual who planned to change the Doctor's personal timeline by removing the friends he held dear.

Working with the Animus and the Zarbi, he was successful in capturing the First Doctor's companions Barbara Wright, Ian Chesterton and Vicki Pallister.

Manipulating a T-Mat machine, he captured the Second Doctor's companions Jamie McCrimmon and Zoe Heriot.

Using a vortex manipulator, he appeared in front of the Third Doctor, grabbing the Doctor's companions Liz Shaw, Sarah Jane Smith and the Brigadier and teleporting away after telling the Doctor a single message: "Say goodbye, Doctor".

Once again using the vortex manipulator, he appeared in front of the Fourth Doctor and kidnapped Leela and K9.

Using the vortex manipulator, he appeared in front of the Fifth Doctor and kidnapped Tegan, Nyssa, and Adric. However, the Doctor is now able to remember the other times he's met the cloaked figure. (COMIC: Prisoners of Time)

Appearance
From an exterior point of view, the cloaked figure closely resembled the decaying version of the Master. (TV: The Deadly Assassin) He wore a black cloak with a hood, his hands were brown and swollen, and he wore what appeared to be a golden sash. Inside his cloak were what looked like parts of a Cyberman. (COMIC: Prisoners of Time)