|First appearance||101. "Family of Heroes"|
|Voiced by||Imari Williams|
- Boulder has a pet plant named Leafy. This was a far safer pet for the Bot to practice with than his first choice; a lion from a zoo! To be fair, the Burns family had loosely compared the zoo to an animal shelter, so it wasn't really his fault when things went wrong...
Boulder and the rest of the Rescue Bots were originally Cybertron Rescue Team Sigma 17, a space rescue team. Having been on routine patrol before the war between Autobots and Decepticons erupted, Sigma 17 was responding to a distress call that led them into an encounter with an energon draining organism. Barely escaping, they entered stasis and set the autopilot back to cybertronian space. He and the others awoke to Optimus Prime's voice, alerting them to go to Earth.
Boulder has three forms robot, bulldozer, and dinosaur. In robot mode, he can act as a robot suit for passenger and can send out sonar pulses from his palms. In bulldozer mode, his shovel can plow through many material and when slammed down can send out sonar pulses to scan the area. His dinosaur mode is a triceratops with drill like horns. In this form, he is far more maneuverable and he can slam his front legs down to send shockwaves through the ground.