Sorenson

Sorenson was a Morestran scientist who led an expedition to Zeta Minor in the year 37166 to search for new energy source to save his civilisation.

Biography
Sorenson found what he believed to be it when he discovered anti-matter on the planet, but all the members of Sorenson's team were killed by an anti-matter creature. Months later, after being rescued by Vishinsky's landing party, he brought his anti-matter samples aboard Salamar's ship. He refused to believe the Fourth Doctor's warnings concerning anti-matter, and when Salamar ordered the samples to be returned to the planet, he took one and hid it on the ship.

However, the anti-matter infected him, causing him to kill Morelli, De Haan and Reig. At first he tried to control the transformations with a vaccine he created, but eventually succumbed completely. When Salamar tried to kill him, he was killed instead but not before causing the creation of more anti-matter monsters which began killing more crewmembers.

Sorenson was cured when the Doctor returned the last anti-matter sample to the planet. He then suggested that Sorenson look into using the kinetic forces of planetary movement as an alternate energy source. (TV: Planet of Evil)