From The Oracle II
Aurex 802.23 Alpha (Unicron Trilogy Cartoon)Jackhammer was a Decepticon and a friend to Crush Groove. In 2030 CE, when Cybertron was evacuated due to the Unicron Singularity, Jackhammer had the idea to stay on Cybertron to consume all the remaining Energon. Ramjet and Nemesis Prime arrived and told the two that they would become their warrior slaves, but Crush Groove and Jackhammer refused. Jackhammer touched Ramjet, and the energies given to Ramjet by the Elder Gods ripped apart Jackhammer.
- Transformers Collector's Club #2