Walt is convinced that his medical condition is deteriorating, and it looks like that's the case.
Convinced he has little money and even less time, and with the excuse of meeting his mother, he and Jesse set off for the desert for a marathon cooking session over an extended weekend.
Jesse continues to cause trouble for the meth-cooking duo, this time by leaving the keys in the ignition and inadvertently draining the RV's battery, leaving them stranded.
They find themselves stuck in the middle of the desert, cold and without food and water.
At the 11th hour, Walt's knowledge of chemistry again saves the day.