I came across this article today listing a bunch of similarities between Battlestar Galactica and Lost: http://featuresblogs.chicagotribune.com/entertainment_tv/2008/06/battlestar-gala.html
Here are a few more:
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Multiple occurrences of the same number(s):
BSG: 12 Cylon models, 12 colonies, Quorum of Twelve, 12 Lords of Kobol
Lost: Hurley’s numbers appear in multiple places -
Main characters involved in multiple interweaving relationships:
BSG: Dualla, Lee, Kara, Anders
Lost: Juliet, Jack, Kate, Sawyer -
A leader comes down with cancer that’s later treated/cured:
BSG: Roslin’s breast cancer is cured by Hera’s blood
Lost: Ben’s tumor is removed by Jack -
Survivors of a catastrophe are split up and later reunited:
BSG: Pegasus comes across Galactica
Lost: Tail section survivors find Michael, Jin, and Sawyer by chance -
Who’s one of them?
BSG: People panic in season 1 because nobody’s sure who’s a Cylon
Lost: Worries about which one of them could really be one of the Others
Flashbacks
BSG: Multiple main characters have flashbacks to when they were on Caprica, often in character-centric episodes
Lost: Multiple main characters have flashbacks to when they weren’t on The Island in character-centric episodes
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Flashforwards
BSG: Audience surprised when the show advances a year and a half in the season 2 finale
Lost: Audience surprised when the show uses flashforwards instead of flashbacks in the season 3 finale -
Traitors
BSG: Baltar taken in and respected by the Cylons
Lost: Locke taken in and respected by the Others -
The “bad guys” have issues reproducing
BSG: Cylon’s can’t reproduce on their own
Lost: Others can’t reproduce on their own (babies conceived on The Island don’t come to term) -
Joining forces
BSG: The humans and Cylons eventually work together to find Earth
Lost: The survivors and Others unite together against Whitmore’s freighter -
Fixed-time loops
BSG: The Cylons chase after the humans every 33 minutes
Lost: Hurley’s numbers need to be entered in the computer every 108 minutes -
Big to-do about opening a door
BSG: Kara goes all the way back to Caprica to get the Arrow of Apollo for opening the Tomb of Athena
Lost: The survivors go all the way across the island to get dynamite for opening the Hatch -
A curse word is used that gets around the US censors
BSG: Frak
Lost: Sodding -
Each episode starts out with a “Previously on [showname]” recap
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Both have summaries made by the same production company (see http://www.methodder.tv/programming/)