Battlestar Galactica backdrop

Battlestar Galactica S4E8 — Sine Qua Non

7.7

Battlestar Galactica•Season 4•Episode 8

Sine Qua Non

7.7/10 · 1,824 votesMay 30, 200844 min

Ranked #16 of 20 in Season 4•−0.5 vs season avg

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.

Directed byRod Hardy

Written byMichael Taylor

Previous episodeE7 · Guess What's Coming to Dinner?Next episodeE9 · The Hub

Seasons4

Cast10

Edward James Olmos

Edward James Olmos

Commander William Adama

Mary McDonnell

Mary McDonnell

Laura Roslin

Jamie Bamber

Jamie Bamber

Lee 'Apollo' Adama

Katee Sackhoff

Katee Sackhoff

Kara 'Starbuck' Thrace

James Callis

James Callis

Gaius Baltar

Tricia Helfer

Tricia Helfer

Number Six

Tahmoh Penikett

Tahmoh Penikett

Karl 'Helo' Agathon

Grace Park

Grace Park

Sharon 'Boomer' Valerii

Michael Hogan

Michael Hogan

Saul Tigh

Aaron Douglas

Aaron Douglas

Galen Tyrol

Crew5

Rod Hardy

Rod Hardy

Director

Michael Taylor

Michael Taylor

Writer

Mike Mitchell

Mike Mitchell

Stunt Coordinator

S

Stephen McNutt

Director of Photography

G

Gib Jaffe

Editor

Discussion

0 comments

Join the conversation

Share your take and reply to other fans.

No comments yet

Be the first to share your thoughts on this episode.

Episode Summary

"Sine Qua Non" is episode 8 of Battlestar Galactica season 4. It scored 7.7/10 from 1,824 votes, ranking #16 of 20 episodes this season (season average 8.2). Directed by Rod Hardy and written by Michael Taylor, it aired on May 30, 2008.

Next: E9 · The Hub Best of Season 4