Solon

Mehendri Solon was a human physician and scientist of great renown, and a follower of the Time Lord tyrant Morbius. After writing a famous paper on microsurgical techniques in tissue grafting, Dr. Solon went into hiding on the planet Karn. There, he developed the techniques which enabled him to create a new body for the brain of Morbius, which had survived his execution. In an isolated castle on Karn, Solon was assisted by his simple servant Condo. Spaceships often crashed on the planet, and Solon constructed a horrendous patchwork body out of the alien survivors' body parts. He planned to house Morbius' brain in it. When the Fourth Doctor and Sarah Jane Smith arrived, Solon needed only a head to finish his monstrous creation, and hoped to use the Doctor's. Sarah prevented this, and Solon was forced to use a glass bowl instead.

Solon was killed when the Doctor created cyanide gas and blew it into his laboratory.

The Past Doctor Adventures novel Warmonger by Terrance Dicks depicts Solon's earlier life as a follower of Morbius, and shows how he saved his brain. The canonicity of the novels is uncertain.