Penance
Summary
Picard learns from Q that he and his companions are in an alternate timeline where humanity has formed the xenophobic "Confederation of Earth", systematically eradicating or enslaving alien races. Picard, the Confederation's greatest military commander, has been granted the honor of executing the last Borg Queen by Seven of Nine, who is the President of the Confederation and married to the Magistrate. The group reunite and learn from the Borg Queen that they can prevent the Confederation's formation by travelling to Los Angeles in 2024, which they can only do with the Queen's help. Agnes, Raffi, and Elnor take control of communication and transporter systems in Confederation headquarters while Seven and Picard buy time at the public execution.
Summary from Wikipedia, CC BY-SA 4.0.
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