The Germs' unlistenable, drunken, and incompetent set can be seen here on YouTube. It's a 1979 concert; the band broke up later because that's what bands did. Wikipedia:
Shortly after that, Crash contacted Smear about a Germs "reunion" show, claiming it was necessary to "put punk into perspective" for the punks on the scene. However, Smear has said Crash told him privately he wanted to earn money for heroin with which to commit suicide.
Mission accomplished on Dec 7th, 1980. Lorna Doon does not have her own Wikipedia entry; here real name was Teresa Ryan. Still around and still playing.
How Amy Winehouse barged into the scene on the right I can't say.