One of the most interesting character backgrounds in the Beast Wars belongs to Rampage. It was explained by Optimus Primal that the "dark secret" of the Axalon's journey was to dispose of the individual, at the time in stasis-lock, known as "Protoform X" in deep space. We learn that 'X' was the result of the seemingly immoral experiments of the Maximal Elders, in their attempt to replicate Starscream's mutant indestructible spark!

Optimus and the Maximal's mission with regard to Protoform X was incomplete and his pod crash landed on primitive Earth along with the rest of the stasis pods. Rampage was reborn a huge Transmetal crab, by virtue of his stasis pod absorbing the technology waves released in the Trans-warp explosion. Rampage is a renegade Predacon, who dislikes Megatron, and wouldn't follow a command were it not for the control Megatron has over his twisted and fragmented spark. He tolerates Megatron only in waiting for the right moment to take back his spark and control his own destiny.

Character Bio from from package "Tech Specs"
The result of an experiment gone awry, Rampage is an evil titan devoid of mercy. Calculating and fearsome, he is a legend among Cybertrons, and it is rumored that his spark cannot be extinguished. In king crab mode Rampage uses his hulking claws to generate colossal tidal waves, induce earthquakes, and trigger landslides. Thought his bulk hinders his overall dexterity, Rampage makes good use of his impenetrable armor and multi-weapons arsenal in crab, tank and robot modes. Galva-conductors on his back channel deadly electric currents that he disperses at will. Rampage customarily activates his Gatling cannon to finish off his enemies in a deluge of cluster missiles. All Cybertrons fear his unmatched aggression.