On Graves, main cast is a casting designation for actors who are contracted to appear in any episode of the season at the request of the producers. Main cast actors, despite being first-billed, rarely appear in all the episodes of a given season. Some appear in relatively few episodes.
Season 1[]
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| Nick Nolte as Richard Graves |
Skylar Astin as Isaiah Miller |
Heléne Yorke as Olivia Graves |
Christopher Lowell as Jeremy Graves |
| (10 episodes) | (10 episodes) | (10 episodes) | (9 episodes) |
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| Callie Hernandez as Samantha Vega |
Sela Ward as Margaret Graves |
| (10 episodes) | (10 episodes) |
Season 2[]
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| Nick Nolte as Richard Graves |
Skylar Astin as Isaiah Miller |
Heléne Yorke as Olivia Graves |
Christopher Lowell as Jeremy Graves |
| (2 episodes) | (2 episodes) | (2 episodes) | (2 episodes) |
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| Callie Hernandez as Samantha Vega |
Sela Ward as Margaret Graves |
| (2 episodes) | (2 episodes) |











