Positron's Nemesis Badge
From City of Heroes: Rebirth - Wiki
Description
In the past you rescued Positron from the Praetorians. Perhaps today you might not do the same.
How to Get
Defeat Olympian Guard in the Rescue Statesman mission of Maria Jenkins's A Hero's Epic
Note
The Positron's Nemesis badge is awarded to characters of the villain and rogue alignments. The same badge on heroes and vigilantes is called Positron's Pal.