Ep 21. Double Jeopardy

SG-1 travels to a planet with an abandoned Goa'uld pyramid. During the exploration, they encounter replicators, and later find out that the pyramid is a trap that was created by the Goa'uld System Lord, Sokar. The team is captured by Sokar's forces and is taken to a fortress prison called Ne'tu.

Meanwhile, a clone of Colonel Jack O'Neill, created by an alien race called the Asgard, is activated on Earth. This clone has all of Jack's memories and experiences up until the last time he was scanned by the Asgard. The clone is sent to join SG-1 to help them on their mission to rescue the real O'Neill.

As the team is held in the prison, they gather intelligence about their captors and plan their escape. They discover that Sokar is using the prison to test his new weapon, which is a device that can kill anyone, even the Goa'uld. The team decides to destroy the weapon before it can be used against Earth.

The clone O'Neill proves to be a valuable asset to the team, but he struggles to understand his own identity and purpose. He is haunted by the fact that he is not the "real" O'Neill and struggles with feelings of inadequacy.

SG-1 successfully destroys the weapon and escapes the prison with the help of their new ally, a Jaffa named Rak'nor. However, before they can return home, they are confronted by Sokar himself. In a daring rescue operation, the team manages to defeat Sokar and rescue the real O'Neill.

Back on Earth, the clone O'Neill is faced with the reality that he cannot continue to live as Jack O'Neill. He resigns from the military and begins a new life with the support of his friends and colleagues.

"Double Jeopardy" is an action-packed episode that highlights the themes of identity, loyalty, and sacrifice. It features intense fight scenes and suspenseful moments that keep the audience on the edge of their seats. The episode also marks a major turning point for the character of Jack O'Neill and sets the stage for future episodes of the series.