| cast |
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| Series Regulars | |||
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| Colin Ferguson | Colin Ferguson as Federal Marshal Jack Carter | Ed Quinn | Ed Quinn as Nathan Stark |
| Erica Cerra | Erica Cerra as Deputy Jo Lupo | James Callis | James Callis as Dr. Grant |
| Joe Morton | Joe Morton as Henry Deacon | Jordan Hinson | Jordan Hinson as Zoe Carter |
| Neil Grayston | Neil Grayston as Douglas Fargo | Niall Matter | Niall Matter as Zane Donovan |
| Salli Richardson | Salli Richardson as Allison Blake | | |
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| Recurring & Guests | |||
| |||
| Jaime Ray Newman | Jaime Ray Newman as Tess Fontana | Matt Frewer | Matt Frewer as Jim Taggart |
| Wil Wheaton | Wil Wheaton as Dr. Isaac Parrish | | |