<P> In the episode `` Kobol 's Last Gleaming '' , Commander Adama sends Boomer on a mission to destroy the basestar orbiting Kobol . On the basestar , she encounters numerous other Number Eight copies identical to herself but she refuses to accept she is a Cylon and personally sets the bomb . After returning to Galactica , her hidden programming takes over and she shoots Commander Adama twice in the chest , putting him in a coma . She is put in the brig and violently interrogated by Colonel Tigh , who has taken command of Galactica during Adama 's incapacity . Tyrol is also suspected of being a Cylon because of his relationship with her , and is thrown in her cell . He tells her not to speak to him or even touch him ; he insists she is a machine and nothing like him . </P>
when does boomer find out she a cylon
`` Kobol 's Last Gleaming ''