Detective Inspector Morrison was a police officer who found the corpse of an old man in the river. He assisted Sarah Jane Smith and Josh Townsend in their investigation into his murder, and he discovered that the old man's DNA matched that of a missing 18-year-old boy called Toby Davenport.
Morrison investigated the murder of Claudia Coster, and following a tip-off, he was forced to arrest Sarah Jane. Investigating further, Morrison interviewed Claudia's neighbour, who provided an alibi for Sarah Jane, and Morrison released her.
Morrison contacted Sarah Jane once again to inform her of the death of her old enemy, Hilda Winters.