Hercules is Herry Monster's most frequently seen doll.
The toy first appeared in Episode 1354, when Buffy talks to Herry about the different kinds of dolls and toys that Native Americans used to play with. In Episode 1827, Herry refers to it as "she," and as his "little teddy monster" in Episode 2000.
He has been featured with Herry in "Guys and Dolls," "A Song for Two," "Moonshine," "Monster Lullaby," and "Late Night on Sesame Street" with Conan O'Brien.
Hercules was also featured in Episode 1967, the street story of Episode 3793 when Herry slept over at Gabi's house, and briefly in Episode 3886. The doll was named Rupert in Episode 3361.
In merchandise, Hercules has appeared with Herry as a PVC made by Tyco, and in the books Baby Love and The Fix-It Shop.