Which is Doctor III? there's been lots. I'm assuming you're using the Authority at the end of the Revolution arc, but I'm only half-way through it right now, so I can't say for sure.
Honestly, though, Jenny Quantum and any Doctor are beyond everyone else in this fight by a wide margin. The only (small) possibility is if Flash speed-blitzes them before they do anything. But give them enough time to form a thought, and the fight will be over.
Quasar, GL, and Flash are the only ones I could see lasting a while. But they're screwed too.
Quasar is not the uber power one. He is a Imperial Guard. http://www.marveldatabase.com/wiki/index.php/Neutron_%28Imperial_Guard%29
Even still, unless they have anyone who can fight off high-level matter manipulation from Jenny and Doctor, they're done for.
It's all about the situation. Flash could feasibly take them out in time if it's a "Ready GO!" style fight (he'd have to go for the brain too...the body wouldn't work as they could reform themselves with a thought), but otherwise Authority wins easy.