Erich Strauss

 was a scientist on Planet Z02-80535. He didn't think that the species on the planet were of importance, and if someone had to mine the planet, it might as well be their company. He and Michael Kelin often argued the matter.

When the Third Doctor and Sarah Jane Smith arrived, he figured the Doctor was a saboteur and a con man. He was appalled to learn that the slug-like creatures were sentient.

Strauss and the rest of the team were killed when the Builders attacked them. (PROSE: Primitives)