The unnamed colonel was a character in The Impostors. He was part of General Lambert's team in hunt for International Rescue. Along with his guard, they searched Tracy Island without success.

At the Central Office of the General Staff Command (l.)

The search on Tracy Island
Puppet[]
The Colonel's puppet appeared in the following episodes (listed in production order):
- 6. The Mighty Atom: the driver of the Atomic Irrigation Station Tour Bus
- 9. Move - And You're Dead: the Automobile Park Operator at Parola Sands Raceway
- 18. 30 Minutes After Noon: Garfield
- 19. The Impostors: the Colonel who visits Tracy Island
- 21. Cry Wolf, an operative at Satellite HQ
- 23. The Duchess Assignment: a gambler at the French Casino, a Fireflash passenger, and a spectator at the London Air Display.
- 25. The Cham-Cham: a guest at the Paradise Peaks Hotel
- 27. Atlantic Inferno: Sir Harry
It was also seen twice in the movie Thunderbirds Are Go: first as one of the members of the SE Board during the meeting at the Space Exploration Center, and again later, as reporter number 13 at the Press Conference (Zero-X). In Thunderbird 6 it was seen briefly at the Indian Bazaar.