Batman: The Animated Series adapts a classic tale from the 70's. Len Wein's "Moon of the Wolf" was brought to life in the episode of the same name.
Professor Milo (Treat Williams) has prepared a bizarre steroid for millionaire athlete Anthony Romulus (Harry Hamlin, ex-LA Law), which includes some timber wolf extract, the wolves stolen from the Gotham Zoo. This was Milo's 2nd appearance in the series.
Worth noting: Peter Scolari, most recently on Gotham, is heard as zoo security guard John Hamner, but does not appear in this scene.
In the original story, it was never suggested that Milo's formula was actually a steroid, but then, in the 70's, steroids weren't as prevalent an issue as they would later become.