A con man or con artist was a type of criminal who specialised in deception.
- "Simple enough, really. Find some harmless piece of space junk, let the nearest Time Agent track it back to Earth, convince him it's valuable, name a price. When he's put fifty percent up front, oops! A German bomb falls on it, destroys it forever. He never gets to see what he's paid for, never knows he's been had. I buy him a drink with his own money, and we discuss dumb luck. The perfect self-cleaning con."
Alexander Martin was a Kanatian con man. He once impounded Jack Harkness' ship while pretending to be a customs official on Balthazar. He later pulled another con where he pretended to be a health inspector at a Spice Bazaar on Velecerol. (PROSE: The House That Jack Built)
Jack Harkness became a time-travelling con man after leaving the Time Agency. Believing the Ninth Doctor and Rose Tyler to be Time Agents, Jack "threw [them] the bait" of a Chula ambulance. He intended to sell them the stolen ship for a high price, just before a German bomb was to fall and destroy the ship and any evidence of foul play along with it. (TV: The Doctor Dances)
Nardole was once a con man. When asked to look after a group of humans, he remarked "You know what I was like. There's more than three people in a room, I'll start a black market. Send me with them, I'll be selling their own spaceship back to them once a week." (TV: The Doctor Falls)