"The Passage" is the tenth episode of the third season from the science fiction television series Battlestar Galactica.

Athena, who has been doing reconnaissance, discovers a planet where abundant algae is found that can be used as a nutritious, if unappetizing, food source.

Kat tearfully admits she was once a "trucker" — a smuggler of drugs and of criminals, and says she stole the identity of a woman who had died just prior to the Cylon attack on the Colonies.

Deeply shaken by the insinuation she is a traitor, Kat retorts at the time the Colonials didn't know some Cylons had human appearances.

Inside the Cylon fleet, Gaius Baltar grows concerned about the strange behavior of a Number Three.

Kat is plunged into a deep state of depression from a combination of guilt about her false identity, the loss of the ships, and the physical and psychological stresses of flying through the cluster itself.

Baltar and Three try to interpret her oracular words, eventually determining that the eye of the cow is a reference to "cow-eyed" Hera.

Back at the Colonial fleet, orbiting a planet in the shadow of a star cluster, Starbuck visits the dying Kat in sickbay in remorse over her earlier words to her.

All of the Galactica's pilots are gathered in front of a chart listing the command structure of the flight group.

The pilots somberly watch as Admiral Adama swaps Kat's name with Apollo's, so making her the CAG.

Later, Starbuck is shown, trying to hold back tears as she affixes Kat's picture to the wall commemorating the missing and deceased.