When creating ALF's voice, Fusco initially took inspiration from that of Rowlf the Dog, a Muppet character performed by his creator, Jim Henson. Rowlf's gruff voice, though, ended up straining Fusco's vocal chords, which led him to invent a new voice that was much lighter, until it evolved into ALF's voice as it is known today. However, in early episodes of the series, ALF speaks with a voice reminiscent of the earlier, Rowlf-esque voice.[1][2]