Generate a question that has the following answer: Humungus and Wez for the following movie plot: With supplies of petroleum nearly exhausted in the near future following a major energy crisis and a global nuclear war, ex-Main Force Patrol officer "Mad" Max Rockatansky (Mel Gibson) roams the now-depopulated and desolate desert in his scarred, black supercharged V-8 Pursuit Special several years after the events of the first film, scavenging for food, water, and fuel. His only companions are an Australian Cattle Dog and a rare functioning firearm a sawn-off shotgun for which ammunition is very scarce. While trying to escape a group of gang members led by a crazed motorcycle rider named Wez (Vernon Wells) - Max manages to crash two of the gang members' vehicles and injure Wez; recognising his defeat, Wez flees. After collecting some fuel from the destroyed cars and checking a nearby Mack semi, Max inspects a nearby autogyro for fuel. Its pilot, the Gyro Captain (Bruce Spence), ambushes Max and manages to capture him briefly before being overpowered. In exchange for his own life, the pilot guides Max to a small oil refinery nearby. Max arrives to see the facility is under siege by a gang of marauders riding a motley collection of cars and motorbikes. The gang leader, known as "Lord Humungus" (Kjell Nilsson), tries to convince the refinery's defenders to surrender the facility in exchange for safe passage out of the area. A group of defenders attempts to break out of the compound, but the marauders capture, torture, and kill all but one of them, who is rescued by Max. Max makes a deal with the mortally-wounded sole survivor: he will bring him back to the compound in exchange for a tank of fuel. The man dies shortly after they enter the facility, and the facility leader, Pappagallo (Michael Preston), reneges on the deal, saying it died when the survivor died. His group is on the verge of killing Max when the marauders return, and Humungus repeats his offer. When the Feral Kid (Emil Minty) kills Wez's male companion, Wez becomes enraged, urging his leader to take the compound; Humungus wrestles Wez...
The answer to this question is:
The head on collision with Humungus's car kills who?