Sawtooth is a predatory fish-like Mini-Con. He worked temporarily to Clawtrap's Team, but when Starscream was arriving to Earth he and the other Weaponizer Mini-Cons betray Clawtrap and Scavengers and fled Scavengers' ship. Later the Weaponizer Mini-Cons helped Bee Team to save Bumblebee. In addition Sawtooth is some kind of relationship with Fixit.
Season 2 1/2
Sawtooth and his fellow Mini-Cons were captured by the Decepticons in their youth and experimented on. Given the ability to combine with their larger brethren, the Mini-Cons were stored in a laboratory in Darkmount until Starscream stumbled on them. They managed to escape Starscream and fell in with some scavengers so they could escape Cybertron, only to find their new hosts were heading for Earth. They set about trying to work out a way to abandon the scavengers and leave the planet.
In Strongarm´s Big Score, Sawtooth accompanied Scatterspike to Mount St. Hilary, where the pair set about drilling to find Autobot technology. When they were stumbled on by Strongarm and Fixit, Sawtooth was able to temporarily take control of the larger Autobot during the ensuing fight. He went after Fixit when the other Mini-Con went to stop the drill, and attempted to plead with Fixit to let them have what they wanted, however when it became clear that the drilling was causing the mountain to become unstable, Sawtooth and Fixit began working together. They were temporarily trapped as the cavern destabilized, and after the danger had passed, Sawtooth managed to rescue Scatterspike. They returned to the other scavengers, and Sawtooth reported to Aerobolt about what he'd seen.
In Mighty Big Trouble, the Mini-Cons accompanied the scavengers to an automated ship to find a relic, and Sawtooth linked with Scatterspike in order to head to the ocean floor to search. After the scavengers managed to retrieve the Dark Star Saber, Sawtooth and his companions stole their sub-orbital craft. Detecting a power source capable of getting them offplanet, they invaded the scrapyard looking for it, only to be told it had already been destroyed.
In Mini-Con Madness, their craft eventually ran out of fuel, but they ran into the Autobots again and after Aerobolt recognised Optimus Prime, the two groups teamed up. During an ensuing fight with the scavengers, Sawtooth temporarily linked with Strongarm, only to be separated from her and injured. He and his companions were snatched up by Starscream.
In Worthy, Starscream attempted to merge with the Mini-Cons, only for it to fail because Tricerashot was missing. He was eventually able to obtain the last Mini-Con and merge with all seven Mini-Cons. them all, however Fixit was able to activate a signal and separate Aerobolt. Aerobolt found Optimus and linked with him, providing the Autobot leader with a powerup that let him go up against the super-powered Starscream. The super-powered Starscream dueled with Optimus until he was able to be lured into range of Fixit's signal, which separated him from the Mini-Cons. Sawtooth and his fellow Mini-Cons left Earth on the sub-orbital craft, now modified by Fixit for space travel.