After the second attack against Sigma, it became clear that it would not be easy to defeat
the former leader of the hunters. Cain industries reacted with creating a new, advanced
scientist reploid - Doppler, made in the image of the last doctor of robotics.
Meant to develope new weapons and armors, he also soon realized what Sigma was and began
to create an anti-virus program. Sigma - unsatisfied about Abyll's cooperation -
decided, that if he could not have the original scientist, he should at least get
the reploid made in its image. Soon after he infected Doppler, he gave out a "cure" to
the Mavericks, who then moved over to Dopplertown, a secret hideout for Sigma's next attack.