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Early prototypes of these machines were originally designed with a skull like head, appearing to operate as robots rather than mechs.
The Enforcer Prototype was an early blueprint of what would later become the Enforcer. While blueprints of this machine was similar to the current model, the early prototype lacked a dome for a Drophyd to pilot, rather it contained a skull like head instead, suggesting this Enforcer was a robot rather than a mech. This early Enforcer model was originally designed by Tachyon with the aid of Lombax technology, under the request of Azimuth to build weapons in order to protect the Polaris Galaxy. Tachyon; however, had no intention of aiding the Lombaxes, rather he planned to render them extinct for what they did to the Cragmites. When Tachyon was able to obtain the Raritanium needed to buy the Drophyds loyalty, he modified all existing models of the Enforcer by removing the skull-like head and replacing it with a dome for a Drophyd to operate.
A larger variant of the Enforcer was seen once, during the Imperial Army's invasion of Metropolis.
| "Let's just stomp around until we squish it!"
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- Although the Enforcers were not fought on planet Kerwan, one was briefly encountered after a warp pad, and then hopped away leaving Ratchet to fight the Drophyd troopers on the balcony. However, if a Groovitron was deployed before the Enforcer hopped away, it would remain there and continue to attack Ratchet like normal, although it could not be damaged by means of weapons or devices.
- An unmanned Enforcer/B2 Brawler was seen in the opening cutscene of PlayStation Move Heroes. As there was no Drophyd inside it, it is thought that it was simply shown as a notable enemy with no canonical elements.
- Ratchet & Clank Future: Tools of Destruction (first appearance)
- Ratchet & Clank Future: A Crack in Time