 Teyla, Sheppard, Weir, Ford and McKay arrive on a planet to find the stargate covered in fog. Rodney finds out the fog is generating a massive amount of energy, allowing travel back to Earth. The team decides to send a message to Earth. Someone responds and mentions there have been some changes on Earth. He tells the Asgard, an alien ally, have equipped the ship Prometheus with engines capable of reaching other galaxies. A while later all four seem to have traveled to Earth. Sheppard is showing Teyla around, Weir visits her partner Simon, Ford is at his parents, Rodney decides to go home for a while. Then an explosion on the Prometheus prevents them from returning and the team finds out some things that are unchangeable have been changed.