Sebastian Cord is fictional character in the Top Secret/S.I. espionage role-playing game.
Cord is an agent of the ORION Foundation, a covert operations agency. He goes by the codename Mercury and leads the M-Squad unit. Cord has a weakness for gambling and is very proficient in calculating odds in games of chance. He is from Austin Texas. A modified Mauser pistol is Cord's weapon of choice. He is also fond of his Alfa Romeo. In The Hollow Earth Affair, it is hinted that he had a history with fellow-agent Carol McKinney.
Cord is proficient at card counting.
- Top Secret/S.I.. Douglas Niles, Warren Spector (1987). ISBN 0-88038-407-7
- Web of Danger (Double Agent: Acolytes of Darkness/Web of Danger by Flint Dille and David Marconi/Aaron Allston ISBN 0-88038-550-2)
- The Hollow Earth Affair (Double Agent: Royal Pain/The Hollow Earth Affair by Richard Merwin/Warren Spector ISBN 0-88038-551-0)