Rascla caused a malfunction on board the Doctor's TARDIS, forcing it to land on Axa, moon of Rascla's native Torm. From there, Rascla brought the Fourth Doctor, Sarah Jane Smith and Harry Sullivan to Torm and used a Nucleonic Body Separator to possess the Doctor's body. He planned to use the disguise to infiltrate a peace conference on Mitra B and release deadly germs, killing the Mitrans.
Rascla left in the TARDIS and entered the conference. However, at that point, the Doctor re-entered his body and engaged Rascla in a mental battle for control. The Doctor defeated his opponent and Rascla was killed. (COMIC: The Body Snatcher)