He fought against Ba'al and was defeated some time in Earth's past, then went on to serve him as an underlord. For some time he, like Astarte, was unquestionably loyal to Ba'al and served as the military commander for his master's Jaffa legions who were situated on the frontier of Ba'al's domain. As the god of death, the opposite of Ba'al, he set himself up as a fiend in his subjects' eyes so that Ba'al, or indeed any of his underlords, could act as a hero when they cast the "dark" god out. (RPG: "Living Gods: Stargate System Lords")
He ruled over P4S-237 for a hundred years after Ba'al abandoned it, keeping the Naquadah mining operation there from his master and taking the spoils as his own. He planned to overthrow Ba'al and take his place as System Lord. The opportunity came to him when Ba'al failed to eliminate Lord Yu in a battle that was to be a final blow against him. Yu escaped and inflicted heavy casualties on Ba'al's forces. His failure caused him to greatly lose favor in the eyes of his master, Anubis. SG-1 discovered him on the planet and soon learned of his mining operation, threatening to inform Ba'al of it. Mot ignored these threats, however, and instead threatened to execute several of the inhabitants of the planet. He intended to kill Ba'al and take his place and destroy Stargate Command. In order to destroy Stargate Command, Mot purposefully allowed Natania, a local villager, to help the SG teams to escape. Mot had his Jaffa guarding the Stargate, ready to attack once the teams sent their IDC. Thanks to a premonition by Jonas Quinn, the SGC learned of the ambush and General George S. Hammond attempted to radio a warning. While the message failed to reach the teams, Chazen heard it and sounded the alarm once the prisoners were found missing, ruining the ambush. Enraged, Mot confronted Chazen and turned his kara kesh upon the man. Before Mot could torture him to death, he was shot twice by Natania with one of the team's pistols, killing him in revenge for Mot murdering her husband. The Tau'ri were able to defeat Mot's ambush and return with reinforcements to finally liberate the planet from his remaining Jaffa. (SG1: "Prophecy")
Like many Goa'uld, Mot rules through fear and death. He also seeks to destroy the SGC in the faint hope that Anubis would reward him greatly.
- Like many underlords, Mot has been seen using a silver hand device.