Sine Qua Non
Show: Battlestar Galactica --> Season: 4 - Season 4
AirDate: 5/30/2008
Runtime: 44
Voting: 7.4 (18)

Overview: With President Roslin missing along with the cylon base ship a new president must be decided on. Galactica goes on a search for the missing base ship and the Galactica crew members that were on board.
Kate Vernon
Ellen Tigh
Rekha Sharma
Tory Foster
Laara Sadiq
Priestess
Ryan McDonell
Lt. Eammon 'Gonzo' Pike
Richard Hatch
Tom Zarek
Kandyse McClure
Lt. Anastasia Dualla
Donna Soares
Geminon Delegate
Alexandra Thomas
Hera Agathon
Andrew McIlroy
Jacob Cantrell
Judith Maxie
Picon Delegate
Iris Paluly
Delegate Dahlia
Veena Sood
Quorum Delegate
Leah Cairns
Lt. Margaret 'Racetrack' Edmondson
Donnelly Rhodes
Dr. Sherman Cottle
Mark Sheppard
Romo Lampkin
Colin Lawrence
Lt. Hamish 'Skulls' McCall