Master is the brains and Blaster is the braun when it comes to running the massive methane power plant, Underworld, located underneath Bartertown, Master exercises his will while Blaster uses his imposing size to keep the workers in line. Master sees himself as the true leader of Bartertown (even forcing Aunty Entity to admit it over loudspeaker) and as such imposes "embargoes" that cut off Bartertown from the power he produces. Max is sent to observe Master and Blaster in Underworld where he learns that Blaster is extremely sensitive to a high-pitched whistle that Max found in the wasteland, giving him the edge he needed to challenge Blaster to a fight in the Thunderdome. Just as he is about to be killed it is revealed that Blaster has a child-like mind and Master jumps in to defend him as well as threaten to cut off Bartertown from power forever. This leads to Blaster's execution and Master's imprisonment in the pig pens beneath Bartertown, but soon after this he is freed and escapes from Aunty Entity and her forces on board a train stolen from Underworld, and later on the plane used by Jebediah.