- Julianne Moore as Alice Daly Howland
- Alec Baldwin as John Howland
- Kristen Stewart as Lydia Howland
- Kate Bosworth as Anna Howland-Jones
- Hunter Parrish as Tom Howland
- Shane McRae as Charlie Jones
- Stephen Kunken as Dr. Benjamin
- Seth Gilliam as Frederic Johnson
- Daniel Gerroll as Eric Wellman
- Erin Darke as Jenny
- Kristin Macomber as Anne
- Caridad Montanez as Elena
- Eha Urbsalu as Mrs. Daly, Alice's mother (in flashbacks)
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