| cast |
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| Series Regulars | |||
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| Brian Austin Green | Brian Austin Green as Derek Reese | Garret Dillahunt | Garret Dillahunt as Cromartie / John Henry |
| Lena Headey | Lena Headey as Sarah Connor | Leven Rambin | Leven Rambin as Riley |
| Richard T. Jones | Richard T. Jones as Agent James Ellison | Shirley Manson | Shirley Manson as Catherine Weaver |
| Summer Glau | Summer Glau as Cameron Phillips | Thomas Dekker | Thomas Dekker as John Connor |
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| Recurring & Guests | |||
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| Busy Philipps | Busy Philipps as Kacy Corbin | Kristina Apgar | Kristina Apgar as Cheri Westin |