Jake and the Rangers take on Goetz and Ravenwood while a Jericho Ranger makes a choice that will alter his life. Meanwhile, an old friend comes to warn Heather that her loyalties to Major Beck have placed her in serious danger.

Sarah asks Kyle to intervene with Jessi, but his method may prove disastrous; Brian Taylor hits a wall in his quest for Latnok’s approval, and the prom has a serious cash-flow problem.

SG-1 searches for an ancient weapon which could help them defeat the Ori, and discover it may be in the Ori’s own home galaxy. As the Ori prepare to send ships through to the Milky Way to attack Earth, SG-1 travels to the Ori galaxy aboard the Odyssey. The International Oversight committee have their own plans and SG-1 finds themselves in a distant galaxy fighting two powerful enemies.

Walter accepts his new identity as a drug dealer. Elsewhere, Jesse decides to put his aunt’s house on the market and Marie throws Skyler a baby shower.

Sheppard returns to Atlantis after a mission and finds the city abandoned, all systems dead — and instead of ocean, sand dunes as far as the eye can see.

Hawkins receives a call on from someone who knows who he is, where he is and lets Hawkins know exactly when he’ll be caught. Meanwhile, tragedy strikes.

Kyle and Josh become involved in a complicated cheating scandal at school. Meanwhile, Jessi is being pushed by Taylor to train for the Latnok presentation.

The side effects of chemo begin to plague Walt. Meanwhile, the DEA rounds up suspected dealers.

The team is shocked when an old friend, believed to be dead, miraculously returns to them. Teyla plans an escape from Michael’s captivity.

Dale returns from trading with news that the Hudson River Virus has crossed the Mississippi River, and when the town’s vaccine supply is seized Jake coordinates a retrieval operation. Elsewhere, Hawkins is forced to show part of his hand to Beck.