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- Dennis Quaid as Professor Jack Hall
- Jake Gyllenhaal as Sam Hall
- Emmy Rossum as Laura Chapman
- Ian Holm as Professor Terry Rapson
- Sela Ward as Dr. Lucy Hall
- Christopher Britton as Vorsteen
- Arjay Smith as Brian Parks
- Dash Mihok as Jason Evans
- Jay O. Sanders as Frank Harris
- Sasha Roiz as Parker
- Austin Nichols as J.D.
- Adrian Lester as Simon
- Tamlyn Tomita as Janet Tokada
- Glenn Plummer as Luther
- Perry King as President Blake
- Kenneth Welsh as President Raymond Becker
- Amy Sloan as Elsa
- Sheila McCarthy as Judith
- Nestor Serrano as Tom Gomez
- Christian Tessier as Aaron