By the end of Season 3 of Better Call Saul, a near-fatal car crash forces “Jimmy” and “Kim” to re-evaluate what’s truly important to them — and how far they’re willing to go to pursue their ambitions. While Kim chooses to take a step back from her fledgling solo practice to recuperate, Jimmy tries to make amends with his brother. Chuck rejects Jimmy’s attempt to reconcile and soon relapses, tearing apart his house to remove any last pulse of electricity and then finally setting a deadly fire.

In the critically acclaimed drama’s fourth season, Chuck’s death catalyzes Jimmy McGill’s transformation into “Saul Goodman.” In the wake of his loss, Jimmy takes steps into the criminal world that will put his future as a lawyer — and his relationship with Kim — in jeopardy. Chuck’s death deeply affects former colleagues Howard and Kim as well, putting the two of them once again on opposite sides of a battle sparked by the Brothers McGill.

Meanwhile, “Mike Ehrmantraut” takes a more active role as Madrigal Electromotive’s newest (and most thorough) security consultant. It’s a volatile time to be in Gus Fring’s employ, as Hector’s collapse sends shock waves throughout the Albuquerque underworld and throws the cartel into chaos — tearing apart both Gus’s and Nacho’s well-laid plans. While Gus changes course, Nacho finds himself in the crosshairs of deadly forces.