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Cain appears in the original series two-part episode, "The Living Legend," where the Pegasus meets up with the Galactica, under the command of Commander Adama, and its refugee fleet.
Led by the legendary and sometimes arrogant Commander Cain, the fleet is torn in its loyalty between Adama and Cain, but they eventually join forces in a daring attack on the Cylons.
In the remake, the character is Admiral Helena Cain, who is Commander Adama's superior officer, and is portrayed by the actress Michelle Forbes.