Shades of Grey (S03E18)

SG-1 travels to Tollana to negotiate a trade. Col. Jack O'Neill becomes extremely annoyed when the Tollans refuse to cooperate, due to their fear that any weaponry given to Earth would more likely be used on itself than to protect against the Goa'uld. In an act that shocks the rest of his team, O'Neill steals a Tollan device as they are departing back to Earth. Upon hearing of Col. O'Neill's deed, an outraged Gen. Hammond relieves O'Neill of his command. When the Tollans pay a visit and announce that they intend to break all ties with Earth because of O'Neill's crime, Hammond has no choice but to offer O'Neill early retirement. Col. Maybourne, having learned of O'Neill's indiscretion, pays him a visit at home to make an interesting offer: Join a rogue stargate team, under Maybourne's command, that steals alien devices for Earth. (Metro-Goldwyn-Mayer (MGM))