- as Charles „Chuck“ Irving Bartowski
- as Heather Chandler
- as Sarah Lisa Walker
- as Mark Ratner
- as John Casey
- as Dick Duffy
- as Dr. Eleanor “Ellie” Faye Bartowski
- as CIA Director Graham
- as Morgan Grimes
- as Dr. Devon Christian Woodcomb
- as Big Mike
- as Lester Patel
- as Jeff Barnes
- as General Diane Beckman
- as Anna Wu
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