Darkwing Duck Season 1 Episode 18

In order to catch a pair of crooks, Darkwing signs up at the health center where they work. What he doesn't count on is Herb and Binkie Muddlefoot tagging along. And when DW and Herb become stuck together, it'll be even tougher to stop the old man in charge, who's willing to do anything to attain the elixir of life.