When an unassuming high school chemistry teacher discovers he has a rare form of lung cancer, he decides to team up with a former student and create a top of the line crystal meth in a used RV, to provide for his family once he is gone.

With Jesse on the run and Mike in hot pursuit, Walt negotiates a bargain with Gus and concocts a disturbing plan to provide for his and Jesse's safety.

Hank pushes Gomez to pursue one last lead, while Walt struggles to protect the family. Jesse gets alarming news and rushes to meet with Mr. White.

Walt and Jesse team up to take on Gus. With Saul's help, Walt finds an unexpected ally.

All bad things must come to an end.