I literally just watched Stargate SG1, season 4, episode 16, where they met an advanced alien race that secretly sterilized 90%+ of the human population through vaccines, and ended up saving humanity by sending a warning back in time.
I've always wondered if that would be possible when quantum computing was developed; if quantum space didn't follow the same rules of time as classical space does. It certainly raised my eyebrow when Q showed up in 2017, around the time it was predicted that quantum computers would be developed.