The Others

a phenomena that has been around since we started exploring past the asteroid belt, it is one of many horrors of the void that astronauts swap pale-faced stories of. The causes are still unknown and inexplicable. When travelling through empty space, sometimes one member of a crew will begin exhibiting several strange psychoactive symptoms - headaches, fatigue, nausea, vertigo, paranoia, auditory hallucinations, acute astroagoraphobia, euphoria, or memory loss. After a certain point, they will lapse into a trance-like state, at which point they will calmly put on an EVA suit, if one is available, and leave the vessel. Their bodies are never found, and they are never seen nor heard from again. If questioned by other crew, their responses are always similarly vague - "they're here", "the others are calling me", "I'm returning to them", or "the others are expecting me". Attempts to keep the affected person restrained have resulted in them breaking their limbs and chewing through their bonds to escape, and any attempt to physically prevent them from leaving results in violent retaliation. However, if one can prevent the affected person from leaving, after several minutes or travelling a certain distance, they will eventually snap out of it and become lucid again, neither possessing, nor displaying any residual mental damage from the experience. When questioned, they don't retain any memory of their experience, save for a vague feeling like they had a dream or nightmare that they can't remember.