The Defector

The Defector is a single player level in Call of Duty: Black Ops.

Overview
In this level, you discover the main plot of Black Ops; Mason is being interrogated in a dark room lined with monitors. There's also a strange drug being fed into his bloodstream via needle. The entire game is based around Mason in this room having flashbacks to the various military operations he participated in. This interrogation room is seen at the beginning of the teaser trailer, by the dialog it seems that the interrogators are trying to get Mason to remember the experiences ("this will help you to remember everything, "and maybe something extra to assist"). The "something extra" to assist is probably the drug.

Trivia

 * The Defector has been confirmed to be Viktor Reznov, and you will meet up with him at the end of the mission.
 * It's unknown who the interrogators are, they have American accents and speak English, it's possible that he's being interrogated by the CIA.
 * It is likely that the location of the interrogation chamber is the exact same as the GKNOVA6 labratory, including extremely similar, if not exact, monitors.