| Klaatu | 基努·李维斯
 | |
| Helen Benson | 詹妮弗·康纳利
 | |
| Regina Jackson | 凯西·贝茨
 | |
| Professor Barnhardt | 约翰·克立斯
 | |
| Jacob Benson | 贾登·史密斯
 | |
| Michael Granier | 乔·哈姆
 | |
| Laptop Woman | Alisen Down | |
| Grossman | J.C. MacKenzie | |
| Yusef | Mousa Kraish | |
| Dr. Ikegawa | 神奈川宏幸
 | |
| Scientist #2 | Lorena Gale | |
| Army Sergeant | 理查德·提尔曼
 | |
| Soldier #1 | 帕特里克·萨邦圭
 | |
| Polygraph Operator | David Richmond-Peck
 | |
| Rouhani | Sunita Prasad | |
| Scientist #1 | Serge Houde | |
| Winslow | 丹尼尔·巴孔
 | |
| Grae Man #1 | Craig Stanghetta | |
| Medic #3 | Marci T. House | |
| Guardsman | Andrew Wheeler | |
| William Kwan | Juan Riedinger | |
| Flash Chamber Tech | 琳尼·阿德奇
 | |
| Cop | George Sharperson | |
| Technician | Aaron Craven | |
| Soldier #3 | Shaine Jones | |
| Pickup Truck Driver | Kevan Kase | |
| Medic #1 | Shaker Paleja | |
| Truck Driver | Ben Cotton | |
| Target Tech | 布兰登·T·杰克逊
 | |
| Mr. Wu | 詹姆斯·洪
 | |
| General Quinn (as Roger Cross) | Roger R. Cross | |
| Flash Chamber Engineer | 祖舒华·克洛斯
 | |
| Field Commander Communications Officer | Geoff Meed | |
| Little Boy | 达瑞恩·普罗沃斯特
 | |
| Guardswoman | Stefanie Samuels | |
| Army Corps Engineer Captain | Sandy Colton | |
| Humvee soldier | Josue Aguirre | |
| NYPD #3 | Terence Dament | |
| Train Passenger #2 | Brad Dryborough | |
