The Three Legged Hopper is a minor ghost the Ghostbusters and Slimer trapped with relative ease.
After two hours, the Ghostbusters focused on trapping the Hopper.  Winston Zeddemore entered the dilapidated building occupied by the ghost and opened fire. The ghost hopped away and jumped out a window. Peter Venkman, who was waiting outside, fired a shot off and confined the ghost. Ray Stantz joined in and fired a second confinement stream. Slimer and Egon Spengler trapped it.
While not outright stating it, Ray implied the Hopper was either a Class 2 or a Class 3. 
- Appears in the end credits of the show
- ↑ Peter Venkman (2009). The Real Ghostbusters - "Short Stuff" (1988) (DVD ts. 02:05-02:14). Time Life Entertainment. Peter says: "You just spent the last two hours running around with a Proton Accelerator on your back chasing down a bunch of grossed out goopers for the city of New York and you're bored?"
- ↑ Ray Stantz (2009). The Real Ghostbusters - "Short Stuff" (1988) (DVD ts. 02:15-02:19). Time Life Entertainment. Ray says: "I'm tired of chasing all these little Class 2's and 3's."