Callandra Henderson Tyrol, better known by her nickname "Cally", is a young woman who works as a deckhand on Galactica. During her tenure on the war, she falls in love with her boss, Galen Tyrol. Despite this, she and fellow deckhand Socinus, cover for Galen Tyrol on various occasions during Galen Tyrol's sexual interludes with Sharon "Boomer" Valerii, until Valerii is revealed as a humanoid Cylon. After this revelation, and a near death experience on Kobol, Henderson's anger and hatred for the Cylons leads her to "kill" Valerii during Valerii's transfer to a newly constructed brig.

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