Jaw Bone is a good Rock Lord from the planet Quartex. He is the Lord of Fossils, ruling the Fossil Kingdom, and forms part of Fossilsaurus.
Challenge of the GoBots cartoon
- Voice actor: Foster Brooks
The Fossil Lord was one of the few remaining Rock Lords opposing Magmar's plans to create the Ultra Scepter. After Boulder and his friends were seemingly destroyed in the Sea of Fire, Magmar's troops and their Renegade allies soon turned their attentions to the Fossil Kingdom. The Fossil Lord's forces were soon defeated and Magmar took his sceptre, curtly dismissing the Rock Lord's protests but leaving him alive as a warning. He was found soon after by Boulder and his allies, who had survived and travelled across the wastelands to reach the Fossil Kingdom. The Fossil Lord filled them in and later aided in the attack on Stonehead, detonating the explosives laid on Magmar's vehicles.Battle of the Rock Lords
- Jaw Bone was initially planned to be released as part of the Fossil Lord combiner for the Rock Lords toyline, being advertised in several catalogues. He formed the head of the combined fossil-dinosaur form. However the toy was not ultimately released. However the moulds were retooled and recoloured before being issued as Gattai Saurer in the Machine Robo: Battle Hackers toyline in Japan, which was in turn imported to Europe as Fossilsaurus for Robo Machine.
*Not available in stores
This item has been canceled, with no current plans for release.
- Jaw Bone was only referred to as the Fossil Lord in GoBots: Battle of the Rock Lords and was the only one of the four-member team to appear in the film.