13 is the number interpreted differently by different people.
However, Battlestar Galactica finds the 13th tribe of Cylons on our dear Earth being wiped away by nuclear forces some 2,000 years back with only Ellen Tigh as the final, surviving Cylon, while Kara and Dualla set for the afterlife.
In the medical station, Tricia Helfer (Number Six) and Michael Hogan (Tigh) are pretty excited knowing their baby has a Cylon/Cylon pairing; Doc Cottle's ultrasound comes in aid to picturize their baby, while Alessandro Juliani (Gaeta) in the sick bay, tries obtaining help for his stump displeased and disgusted.
Aaron Douglas (Tyrol) comes in to treat his son Nicholas for a kidney failure.
Tyrol insists on a new kidney and half-Cylon blood, but being told that he is not the actual father of Nicholas (which Cottle let Tyrol know) increases problems.
Edward James Olmos (Admiral Adama) is found at a press conference, refusing any discussions regarding making a Cylon the second-in-command and forming an inter-fleet Cylon-alliance, though Lee makes clear that a Cylon woman is in the fav-list.
The end of the conference finds Tom Zarek (played by Richard Hatch, Vice President) expressing his beliefs that are contrary to an alliance with the Cylons; this makes him enquire on the MIA status of Roslin.
However, Bill and Lee discuss implementing the Cylon technologies with Tyrol and Tigh; they want the FTL drives to be upgraded.
A bar to the plans is that humans and Cylons don't go well together.
Tyrol gets his messages clear regarding Cylons joining the fleet members and even offers them a seat on the Quorum.
Greatly opposed by Gaeta; however, bill is persistent to let the president know about it, who was busy getting rid of all the cancer medication she was receiving.
Gaeta dug up old wounds again while talking to Starbuck, who lost a leg previously and his threats are openly this time.
In the meantime, the Zarek-Quorum meeting stirs up anti-Roslin sentiments and an overall Cylon-hatred.
This threatens the entry of Cylons into the ships unless with explicit consent from the people aboard.
But Roslin, unaware of the affairs, does some running around while Bill tries to make her understand the importance of Cancer treatments and then, about Zarek's anti-Cylon agendum.
But Roslin seems plain disinterested.
Gaius Baltar is seen busy giving sermons to his followers and he narrates the horrors of the unfair punishments they are facing with a horrible Earth.
Tyrol, in the meantime, gets into a brawl with Hot Dog who reveals his identity as the biological father of Nicholas.
The fact that Cylon technologies are being refused from the ships makes Bill and Tigh angry and learns about the mutiny aboard.
He leads a team into a tillium ship to learn that the vice president himself is encouraging the mutiny.
We see the fuel-filled tillium ship jumping away next.