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…

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,…

Kyle begins having cognitive malfunctions and is drawing pictures in his sleep due to the attention demands from the other students during his midterm exams. Meanwhile, Kyle's condition has Jessi…

Walter and Skyler attend a former colleague's birthday party. Jesse tries to free himself from drugs, while Skyler organizes an intervention.