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Cain can refer to the following characters in the Battlestar Galactica saga:
- Commander Cain, commander of battlestar Pegasus in the Original Series.
- Lieutenant Garris Cain, from the mixed-continuity Battlestar Galactica Video Game released in 2003.
- Admiral Helena Cain, commander of the advanced battlestar Pegasus in the Re-imagined Series.
- Lucinda Cain, lead on Project Jupiter and admiral in Colonial Fleet during the First Cylon War as depicted in Battlestar Galactica Deadlock.
- Lucy Cain, Helena Cain's sister, who died in the first Cylon War.