On The Brink, 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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| Jack Black as Alex Talbot |
Tim Robbins as Walter Larson |
Pablo Schreiber as Zeke Tilson |
Aasif Mandvi as Rafiq Massoud |
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