In "
Valley of Darkness," a computer virus created by the Cylons shut down
Galacticas power, but Lieutenant
Felix Gaeta seemingly purged it. In "
The Farm," Commander
William Adama sentenced Specialist Cally to 30 days in
Galacticas
brig for killing
the Number Eight copy (Boomer) who shot Adama. Gaeta determines that the Cylon virus is still active, is responsible for a series of malfunctions aboard
Galactica, and threatens to take full control of the ship. Adama enlists Sharon's help. She confirms Gaeta's diagnosis and warns that a Cylon attack is imminent. Hundreds of
Cylon Raiders and
Heavy Raiders appear and hold formation, preparing to activate the virus. Forced to trust Sharon, Adama allows her to interface directly with
Galacticas systems by inserting a
fiber optic cable into her hand. Sharon helps delete the virus and broadcasts a virus of her own to the Cylon ships, rendering them helpless and easy pickings for the Vipers. Sharon is summarily returned to her cell.
Helo is ostracized by his crewmates for his relationship with Sharon. Haunted by memories of Boomer, Tyrol does not join the celebration of Cally's release. Tyrol and Helo argue about their respective relationships with Number Eight; the argument comes to blows. Inspired by
Lee "Apollo" Adama's comment that "no one's expecting any miracles," Tyrol begins to build a new
starfighter from salvaged parts. Despite initial skepticism, crew members from throughout the ship join the project. At Helo's suggestion, Tyrol uses
carbon composites for the exterior, making it
stealth capable. The completed fighter, known as the Blackbird, makes a successful maiden flight with
Starbuck as
test pilot. At the Blackbird's dedication ceremony, President
Laura Roslin, who has just learned she has weeks to live, praises the fighter's construction as "an act of faith." Tyrol reveals that the fighter is named
Laura in her honor. Helo reconciles with his crewmates, and Tyrol visits Sharon in her cell. ==Characterization==