"Pegasus" is the tenth episode of the second season of the reimagined Battlestar Galactica television series. It aired originally on the Sci Fi Channel on September 23, 2005. Following "Pegasus", the series went on hiatus until January 2006.

In the episode, the human fleet encounters the Battlestar Pegasus, commanded by Admiral Helena Cain. She assumes command of the fleet. Gaius Baltar discovers that Pegasus crew members have been raping and torturing a Cylon prisoner. Cain sentences Helo and Chief Galen Tyrol to death after they accidentally kill a Pegasus officer who was preparing to rape Sharon. In response, Commander William Adama orders Vipers to escort Marines to Pegasus. Cain orders her own Vipers to intercept as the episode ends.

"Pegasus" was nominated for the 2006 Hugo Award for Best Dramatic Presentation, Short Form. It received critical acclaim.

A large unknown ship appears on Galactica's DRADIS. After a tense moment, the ship is identified as the Battlestar Pegasus, a Colonial vessel previously believed destroyed in the Cylon attack on the Colonies. Cain boards Galactica with an armed escort and welcomes the crew "back to the Colonial Fleet." Cain relates to Adama and President Laura Roslin how she ordered a risky maneuver to escape the initial Cylon attack on the Twelve Colonies. Adama recognizes Cain as his superior, but Cain promises not to interfere with Galactica's internal affairs.

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