| Percy Jackson | 罗根·勒曼
 | |
| Grover Underwood | 布兰登·T·杰克逊
 | |
| Annabeth Chase | 亚历珊德拉·达达里奥 | |
| Zeus | 肖恩·宾
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| Hermes | 内森·菲利安
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| Dionysus | 斯坦利·图齐
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| Luke | 杰克·阿贝尔
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| Gray Sister | 米西·派勒
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| Clarisse | 莱文·兰宾
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| Chiron | 安东尼·海德
 | |
| Polyphemus / Laistrygonian | 罗伯特·梅耶
 | |
| Tyson | 道格拉斯·史密斯
 | |
| Gray Sister | 伊薇特·尼科尔·布朗
 | |
| Cyclops | 德里克·梅耶斯
 | |
| Chris Rodriguez | 格瑞·达蒙
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| Gray Sister | 玛丽·伯德桑
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| Thalia Grace | Paloma Kwiatkowski | |
| Young Annabeth | Alisha Newton | |
| Cyclops | 艾力克斯·保诺维奇
 | |
| Reardon | Christopher Redman
 | |
| Young Thalia | Katelyn Mager | |
| Ethan Nakamura | Danny Le Boyer | |
| Young Grover | Bjorn Yearwood | |
| Ichneutae | Jordan Weller | |
| Young Luke | Samuel Braun | |
| Ganymede | Richard Yearwood | |
| Customer | Maxine Miller | |
| Barista | Anthony Shim | |
| Lydian Drakon | David Mylrea | |
| Barista | Camille Atebe | |
| Tereus | Connor Dunn | |
| Half-Blood Demigod Teen (uncredited) | Andrew Plaisance | |
| Demigod (uncredited) | Artin John Tsambazis | |
| Oracle (voice) | 索瑞·安达斯鲁
 | |
| George (voice) | 克雷格·罗宾逊
 | |
| Polyphemus (voice) | 朗·普尔曼
 | |
| Martha (voice) | 奥克塔维亚·斯宾瑟
 | |
| Kronos | 罗伯特·克耐普
 | |
| Additional Voices (voice) (uncredited) | Hanna Frankel | |
