The dependable Dumper transforms into a dump truck. He takes his assignments in stride, knowing that he's strong enough to handle the workload and resolute in his desire to destroy the Renegades.
His twin brother is Pumper.
Challenge of the GoBots cartoon
Dumper, Scratch, Road Ranger, and Dozer arrived to back up Leader-1 when Cy-Kill's Renegades attacked a UNECOM facility. They managed to keep the evil GoBots on the ropes until Professor Von Joy's experimental immobilizing weapon backfired on the Guardians and allowed the unharmed Renegades to escape.
Robo Machines comic
Dumper, Pumper, and Bullseye were stationed aboard a Command Center when Cy-Kill attacked them as part of an elaborate ruse. They managed to capture the Renegade overlord, but only because he planned it in order to infiltrate the Prison Moon.
"Echoes and Fragments"
In an unstable hybrid universe that incorporated both GoBots and Transformers, Dumper was aboard a Guardian shuttle bound for Earth when Megatron attacked and hijacked the ship. He was injured and left for dead in the wreckage of the shuttle.
(Dumper only suffered this fate retroactively due to the machinations of Sideways and Gong. When the events actually took place in this hybrid timeline, it was an Autobot crew who were attacked by Renegades. When the factions flipped, Dumper essentially took the place of Ironhide, whom Cy-Kill had spared when capturing the shuttle.)
- Dumper (GoBot, 1983)
- Friendly Robot Dump Truck
- ID number: 09
- An import of the Machine Robo "Dump Robo" toy, Dumper transforms into... a dump truck. Big surprise.