02E21 - 1969

Through a flaw in star-gate travel, SG-1 lands back in Cheyenne mountain in 1969, only Teal'c Zat prevents them from being incinerated by a Titan rocket launch. They are captured by their own US Air Force, and Carter realizes they can't do or say anything for fear of irreparably altering their own future and thus creating an alternative reality. Yet someone at the base finds on the team an anonymous note to help them - it's Lieutenant George S. Hammond, their future general, who wrote it to his past self and succeeds in allowing them to escape and recuperate their belongings during prisoner transport, so they can search a star-gate to return. The only other help the note offers them are two consecutive dates and exact times. Daniel decides their best chance is meeting Catherine Langford, in New York, without telling the truth or getting caught on the way. While they get a ride from gullible hippies, posing as anti-establishment aliens, Carter realizes the nature of the times: otherwise impossible to predict sun flares...