Sarah Manning
There she was, thinking she was just an identity-stealing con-artist and single mom until she finds out she's part of a global cloning conspiracy—the Neolution!
Beth Childs
The cop's suicide leads Sarah into the cloning conspiracy.
Katja Obinger
The German-born clone tries to warn Beth that their European brethren may be being hunted but ends up on Sarah's trail after Sarah assumes Beth's identity. Once she realizes she's in touch with yet another clone, she's assassinated (though she probably wasn't long for the world anyway, judging by that hacking cough/possible genetic defect).
Alison Hendrix
The desperate housewife of the bunch, the pretty-in-pink soccer mom also develops a pill addiction—which doesn't help with paranoia but does lead to a nifty side business.
Cosima Niehaus
The science wiz befriends Sarah while pretending to be Beth and, though slowed by that nasty respiratory illness that's going around, she joins the quest to discover their true origin.
Helena
Sarah's separated-at-birth-twin is a vicious assassin who's tasked with knocking off other clones.
Rachel Duncan
The "Proclone" aids the Dyad Institute in its research.
Jennifer Fitzsimmons
RIP. Seen only in video diaries, the high school teacher and swim coach was struck down by the same respiratory disease that afflicts Katja and Cosima.
Tony Sawicki
Born Antoinette, the transgender clone was told that he's related to Beth...but not how.
Krystal Goderitch
The non-self-aware clone who's being monitored by her boyfriend wises up (well, sort of) once she's almost kidnapped but saved at the last minute by Dyad agents. Alas, the plan to grab her and put her in comatose Rachel's place is successful.
Sarah & Helena
Here's looking at you...me.
NEXT GALLERY: Ranking the 30 Most Important Deaths on Game of Thrones