Matthew Nable (born 8 March 1972) is an Australian film and television actor, writer and former professional rugby league footballer After playing in the Winfield Cup Premiership during the 1990s for the Manly-Warringah and South Sydney clubs, he wrote and starred in the rugby league-centered drama The Final Winter in 2007. Nable went on to act in films such as Killer Elite and Riddick. He appears on The CW's Arrow as Ra's al Ghul.

Matt Nable plays as Nathan Spears in The Twelve.
Matt Nable is the top #1 member of the cast and appears in 10 episodes.

Kate Mulvany plays as Kate Lawson in The Twelve.
Kate Mulvany is the top #2 member of the cast and appears in 10 episodes.

Nigel John Dermot "Sam" Neill (born 14 September 1947) is a New Zealand actor. He is perhaps best known for his starring role as paleontologist Dr Alan Grant in Jurassic Park and Jurassic Park III. He has also had a number of high-profile roles including: the lead in Reilly, Ace of Spies, the adult Damien in Omen III: The Final Conflict, Merlin in the miniseries Merlin, Captain Vasily Borodin in The Hunt for Red October, Lord Friedrich Hoffman in Snow White: A Tale of Terror, and Alisdair Stewart in The Piano. Most recently he played Cardinal Thomas Wolsey in the Peace Arch Entertainment production for Showtime, The Tudors. Description above from the Wikipedia article Sam Neill, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Sam Neill plays as Brett Colby in The Twelve.
Sam Neill is the top #3 member of the cast and appears in 10 episodes.

Brooke Satchwell plays as Georgina Merrick in The Twelve.
Brooke Satchwell is the top #4 member of the cast and appears in 10 episodes.

Ngali Shaw plays as Jarrod Saunders in The Twelve.
Ngali Shaw is the top #5 member of the cast and appears in 10 episodes.

Marta Dusseldorp is an award-winning popular Australian television and stage actress.

Marta Dusseldorp plays as Lucy Bloom in The Twelve.
Marta Dusseldorp is the top #6 member of the cast and appears in 10 episodes.

Brendan Cowell plays as Garry Thorne in The Twelve.
Brendan Cowell is the top #7 member of the cast and appears in 10 episodes.

Pallavi Sharda (born 5 March 1990) is an Australian-Indian actress.

Pallavi Sharda plays as Corrie D'Souza in The Twelve.
Pallavi Sharda is the top #8 member of the cast and appears in 10 episodes.

Hazem Shammas plays as Farrad Jassim in The Twelve.
Hazem Shammas is the top #9 member of the cast and appears in 10 episodes.

Damien Strouthos plays as Alexi Menelaus in The Twelve.
Damien Strouthos is the top #10 member of the cast and appears in 10 episodes.