Party Crasher Badge
From City of Heroes: Rebirth - Wiki
Description
You crashed a rave and stole a piece of the alloy which makes up Silver Mantis' armor.
How to Get
To earn the Party Crasher Badge, you must complete the Steal Alloy from Silver Mantis mission from Dr. Forrester.
As a Flashback mission, you must complete "Party Crasher" in the Captain (Level 40-45) section.