Este é um episódio Outer Limits , Tempestos . A vacina, parasitas, alucinações induzidas por veneno e o final sombrio combinam.
Commander Virgil is desperately attempting to deliver a serum to his home colony, which is being devastated by a virus, Ellycia C. His wife and young son are there. After his ship crashes into a gas giant, he finds himself shifting between two realities: an ideal one, and one in crisis.
In the "bad" reality, the crash site turns out to be the interior of a living being; while conducting repairs, Virgil is bitten by a spider-like creature and its venom causes him to hallucinate. In the "good" reality, the crew were rescued and delivered the serum; Virgil is living happily with his family but is in treatment for Ellycia C., which is causing him to hallucinate. In each reality, he perceives the other reality as a hallucination, and he is warned he could die if he does not struggle against the other, "false" reality.
Virgil reasons that his family are already safe if the "good" reality is true, but they still need the serum if the "bad" reality is true; so he embraces the "bad" reality to ensure their survival. He heads for the colony in an escape pod and makes contact with his wife, believing he is on track to save both the crew and the colony. However, both realities are false; Virgil and the entire crew are unconscious and being fed on by the alien spiders.