Screwloose's plan came unstuck when real Badniks came to attack the Emerald Hill Zone. Ultra-Duck made a run for it, leaving Amy and Shortfuse to deal with the attackers. Tekno the Canary made sure Bill didn't get away, before removing his mask and divulging his rotten backstory to everyone else.
Shortly after his villanous escapades, Screwloose became a street cleaner. The memory of Ultra-Duck quickly fell out of most people's minds, and he never joined the League of Super-Evil Villains.
He showed up in the "New To STC?" feature, together with other failed supervillains. Unlike the rest, he didn't join the League of Super-Evil Villains.