|Place of origin:||Earth|
|Appearance:||Invasion of the Dinosaurs|
|Main actor:||Dave Carter|
Sergeant Duffy was an officer in the British Army. He was in charge of Number 5 reception centre to which the Third Doctor and Sarah Jane Smith were brought, having been mistaken for looters. (TV: Invasion of the Dinosaurs)
Behind the scenes Edit
Duffy is never named in on-screen dialogue in the episode; he's only identified in the closing credits.