As a megaquake threatens San Francisco, a series of foreshocks wreaks havoc across the city. Now, an elite team of emergency service and disaster experts converge on the anticipated epicenter, working tirelessly to save as many lives as possible and stop the Big One before it strikes.
| Actor | Role |
|---|---|
 McKenzie WestmoreMolly Martin | Molly Martin |
 Grant BowlerEric Martin | Eric Martin |
 Tori GriffithChrissy Martin | Chrissy Martin |
 Jessie B. EvansClay Martin | Clay Martin |
 Tyler ChristopherGriffin Richards | Griffin Richards |
 William BaldwinSenator Terry Carlson | Senator Terry Carlson |
| AAdam H. MarchandDavid Diaz | David Diaz |
| TTola LawalYolanda | Yolanda |
 Mica JavierNatasha Nakami | Natasha Nakami |
 Jack PearsonSven | Sven |
| AAce ChristensenDr. Jennings Lang | Dr. Jennings Lang |
| JJuliet Angelina Hernandez-MarkAva | Ava |
 Paul LoganGoldstone | Goldstone |
| GGabi SinghRebekah Pauling | Rebekah Pauling |
| LLeo VargasNeame | Neame |
| AAllen Richard PeradaDonnenfeld | Donnenfeld |
| UUsman OjibaraFox | Fox |
| JJonni GarroAmy | Amy |
 Jessica DeBonvilleAnela | Anela |
 Joe RocheCharlie | Charlie |
| CChristopher A. SmithClark | Clark |
| PPaula FiumanoDave | Dave |
 Kevin HummelGene | Gene |
 Jeffery Thomas JohnsonGuillermin | Guillermin |
 William GuirolaJimmy | Jimmy |
 Tammy KleinJudge Taylor | Judge Taylor |
 Edmund KwanKeala | Keala |
| EErika DegraffLinda | Linda |
| JJessica Lea RiscoMrs. Jones | Mrs. Jones |
 Hannah SulakOlivia | Olivia |