Tarkin (Dr Who and the House on Oldark Moor)

Count Tarkin was a creation of a scientist. Tarkin locked the scientist in the attic of the house on Oldark Moor. When Dr. Who, Ian Chesterton, Barbara and Susan visited, Tarkin told them the man in the attic was his mad brother. (PROSE: Dr Who and the House on Oldark Moor)

Behind the scenes
The character's name might be based on Grand Moff Wilhuff Tarkin, Imperial Governor of the systems of the Outer Rim and commander of the DS-1 battle station (the first Death Star), a notorious character from Star Wars, played by Peter Cushing, who also played Dr. Who.