As usual, JKR owns the Harry Potter world. I am just embarrassing myself,playing in it.
The alien vessel, manned by the race known as the Qbt (pronounced ker-but), was moving slowly through a star system with a medium sized sun with nine planets circling it. According to the historical records there was life on the third planet from the sun, and he was interested in seeing what stage of development they had reached. When his people had last passed through this system, the humanoid inhabitants were still cave dwellers, using stone tools.
As the vessel approached the planet, he decided to visit the northern hemisphere, as this was where the biggest land mass occurred. His sensors picked up a large amount of electronic signals, as well as small artificial satellites orbiting the planets. He noticed lots of pollution, and signs of nuclear activity, some from weapons, most though from factories apparently using nuclear reactions to produce energy. The plants however were the inefficient and dangerous fission reactors.
The cloaked ship kept on collecting information as he drifted over the large land mass, and he realized that the electronic signals were showing more than fifteen languages, the planet was definitely not unified. He eventually decided that it was time to leave, as though the planet had improved from the stone age, they still had very far to go, before they were ready to meet beings from another planet.
His final act however, would be to abduct a being from the planet, so that he could check out their biological development. As usual for this type of action, he focused on a relatively uninhabited area, using the assumption that a person by themselves would be missed less, than someone from a densely populated area. His scan picked up a being sleeping by themselves in a forest, and he quickly beamed him into one of the holding bays, leaving him there to be checked over at a later point. He then set his navigational system to send the ship to the next star system he was interested in, about twenty light years away, and engaged the faster than light drive. In less than a minute, the ship was already approaching the new system.
Meanwhile in the holding bay, a panicked person woke up, a man named Quirrell, who had the night before made contact with the entity Voldemort and had hosted the spirit in his body for the night. Voldemort was in pain, as his connection to his soul anchors and his marked followers had suddenly become very strained, causing him pain, and making his pain wake Quirrell.
As Quirrell opened his eyes, he realized that he was no longer in the forest he had fallen asleep in, Instead he was in a sterile room, lying on a bed, with machines lining the walls. He panicked and cast a spell, realizing that there were more rooms to his right, but nothing to his left, he immediately twisted and apparated himself himself, as far as could to his left. He materialized in space, and imploded as the pressure of his body gave way to the vacuum of space. Voldemort's spirit separated from the goo that was Quirrells body, and was left hanging in space, wondering where he was.
AN
This story started as a means to meet an off the cuff statement I made on my profile page, about leaving Voldemort hanging. Having achieved that goal, I decided to expand it. Hopefully, you the readers find it enjoyable.