In the "Space: 1999" episode titled "Alpha Child", the first child is born on Moonbase Alpha, but things quickly take a dark turn. The newborn baby, Jackie Crawford, rapidly matures into a five-year-old boy within hours. This sudden transformation is just the beginning, as it becomes clear that the child is connected to a group of formless alien fugitives who plan to take over the bodies of the Alphans. The episode explores themes of identity and the unknown, with a chilling atmosphere as the crew tries to understand and combat the alien threat. It's a memorable episode for its eerie storyline and the unsettling presence of the rapidly aging child.