Ronon Dex is a fictional character in the science fiction television series Stargate Atlantis. Played by Jason Momoa, he is a Satedan, a civilization from the Pegasus Galaxy who had a technological level comparable to Earth in the mid-20th century but met the fate of all advanced civilizations in Pegasus when their homeworld Sateda (P3R-534) was devastated several years ago by the Wraith. When Ronon Dex and the Atlantis expedition first met in the season 2 episode "Runner", Ronon Dex had been a Runner for the past seven years. He joined the Atlantis Expedition shortly afterwards, effectively replacing Aiden Ford on Sheppard's team after Ford had become addicted to a Wraith enzyme and had fled Atlantis.
