少女科学家珊曼莎是地球经历末世浩劫后的幸存者之一。她并未随着他人弃守家园,反而留在地球,并致力寻找让人类生存下去的方法。 在最后一艘宇宙飞船开往遥远人类太空殖民地之际,她留守的决心因为另一位幸存者麦卡的到来而动摇。她必须决定要与麦卡一起出发到人类避难之所开展新生活,还是继续留下来保卫地球。Sam (Margaret Qualley), one of the last survivors on a post-cataclysmic Earth, is a young scientist dedicated to finding a way for humans to adapt and survive, rather than abandon their world. But with the final shuttle scheduled to leave the planet for a distant colony, her determination to stay is rocked by the arrival of another survivor, Micah (Anthony Mackie). She must decide whether to journey with him to join the rest of humanity and begin life anew, or stay to fight for Earth's survival.