Stargate Atlantis (2004)

S1E6 Childhood's End

In "Childhood's End," Sheppard and his team arrive on a planet where the inhabitants have adopted a chilling custom: a ritual suicide that ensures no one lives beyond the age of 24. This harrowing practice stems from their belief that it protects them from the Wraith. As the team navigates this unsettling culture, they grapple with the moral implications of the ritual and seek a way to help the locals break free from this cycle of despair.