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David Cain is the father of Helena Cain.
Cain is a retired colonel in the Colonial Forces.
His daughter writes many letters to him but never sends them, leaving them in her safe. It is probable that Helena writes the letters for personal reasons, as the letter's content suggests that Cain is deceased (Battlestar Galactica: Pegasus).
- There is insufficient information to determine if this separate-continuity character was derived or based on the brief appearance of Helena's unnamed father as a child during the Battle of Tauron in the extended DVD version of "Razor."