In The Revenge of Murray the Mantis, a large, inflatable balloon of Murray the Mantis becomes possessed during the balloon's appearance in a prominent New York parade. Overwhelmed, the Ghostbusters release the Stay Puft Marshmallow Man from the Containment Unit and a mighty battle begins! 
On the day before Thanksgiving, Egon and Ray finished connecting a functioning airlock into the Containment Unit. Using a P.K.E. Meter, Ray confirmed at setting 7, a reading of -0.2 registers. Egon checked the data off a clipboard and announced it checked out with their projections. Ray still wasn't sure why they needed an airlock. Egon revealed he wanted to open diplomatic relations with the spirit world and be the first ambassador. Ray was surprised and worried Egon was drawing a fever. Suddenly, the airlock lit up and Slimer returned from the Containment Unit. Ray joked around and asked Slimer if he enjoyed it in there. Slimer became irate and Ray placated him by telling the location of Peter's jellybeans. Slimer happily flew up and passed through the ceiling.
In the garage bay, Peter and Winston were wiping down Ecto-1. Winston is surprised at Peter's initiative but learned it was just to impress the women at the Thanksgiving Day Parade. Winston deflated Peter and told him there would only be children and mothers. That evening, a crew of workers raced to finish inflating a float for the parade. A woman checked in with the crew leader, Harlen. Harlen promised all would be ready on time. The woman is relieved as she found the warehouse creepy. Harlen told her the building used to be a city morgue. Unbeknownst to anyone, a floor panel glowed and something seeped into the pump inflating the float, a cartoon mantis. The mantis' eyes glowed.
The next day, the Thanksgiving Day Parade drew in crowds of spectators. Ecto-1 was in the procession. The Ghostbusters, Janine, and Slimer were all present. While Ecto-1 waited for pedestrians to cross, Ray spotted the float from the previous night and alerted Egon. Egon looked out and recognized it as Murray the Mantis. Peter is perplexed. Egon and Ray explained he was the star of a popular Saturday morning cartoon who kept the peace in a garden and was the best friend of the gardener's daughter, Posey. As Peter surmised, the float handlers were all dressed up as Posey - wearing blue wigs and pink dresses. Winston spotted Lieutenant Frump who was annoyed the Murray float was holding up the parade. Egon, however, stated it shouldn't be able to do what it was doing. The handlers were forced to let go and the Murray lifted off into the sky. Since it was now a menace to aerial navigation, Peter volunteered to shoot it down.
Peter burst the float but suddenly a giant mantis entity materialized and went berserk. The Ghostbusters and the woman from the previous night boarded Ecto-1 and drove off to Central Park. The woman informed Peter and Ray they filled the float in a former morgue in the Upper West Side. Ray got a flash of insight and theorized they must have caused a release of death force energy held dormant and an ecto surge occurred across the continuum. Peter, meanwhile, introduced himself to the woman. She in turn introduced herself as Ann Lawson. Winston realized the Ghostbusters could be blamed for this fiasco. Ray apprised Egon who then ran quick calculations. Considering a constant half life breakdown rate for all ectoplasmic entities and cross calculating with the known P.K.E. pulse, Egon concluded "Murray" could have a life energy as high as Gozer's. Winston suggested their only choice was "The Big Guy."
Back at the Firehouse, Egon calculated Murray's energy level at 45x1014 Mega Watts. Winston once again stated they needed "The Big Guy." Egon implored Slimer to help but he refused. Peter promised Slimer a mini fridge, ice cream delivered everyday, a crate of donuts, and a Diner's Club Card. Slimer agreed and kissed Peter. The Ghostbusters and Ann scrambled as the police pulled up outside. Egon sent Slimer into the Containment Unit and was dragged off by two police officers. As Frump relayed the Mayor's displeasure at the turn of events, the airlock of the Containment Unit exploded and P.K.E. surged out of the Firehouse's roof into the sky. The energy formed into the Stay Puft Marshmallow Man. Despite Frump's concerns, Peter assured him Stay Puft had gotten better since his last time in the city.
Peter, Ann, Egon, and Frump followed Stay Puft in a NYPD helicopter as Slimer guided him north. They landed in Central Park by Ecto-1 and 2. Peter and Ray took off in Ecto-2 as Winston and Egon monitored from two parallel building roofs. Stay Puft met Murray and a fight soon followed. Egon ordered Slimer to have Stay Puft coax Murray into the alley between the two buildings. Ecto-2 landed in the alley. The Ghostbusters opened fire on Murray and Stay Puft held him in the crossfire. Soon enough, Murray exploded. Stay Puft and Ecto-1 were a little charred from the ordeal. As Ann congratulated Peter, Frump ran off to restart the parade. As Winston volunteered Egon to repaint Ecto, Stay Puft substituted for Murray as an impromptu float.
|Egon: The energy level is 45 megawatts.|
Ray: Well, that's not so much.
|Peter: Hey, I'll bet I'm the only guy who's ever taken you to an un-natural disaster on the first date.|
|Winston: You know, a lot of people are gonna figure that we're responsible for this.|
Egon: Nonsense. If you were a judge, would you convict us, Janine?
- In the Introduction for the episode, available on The Real Ghostbusters Complete Collection, writer Richard Mueller mentions the episode was inspired by the Macy's Parade on Thanksgiving in New York.
- This episode features the short-lived airlock for the Containment Unit. It blows up when the Stay Puft Marshmallow Man is released.
- Peter keeps his jellybeans in a box under his pillow. 
- Both the balloon and the ghost of Murray the Mantis had only four legs, while real Praying mantis' have six.
- Egon mentions Gozer. 
- Winston mentions the giant Twinkie analogy from the first movie. 
- Peter mentions Darth Vader and the Death Star from the "Star Wars" franchise. 
- Slimer finally agrees to help when Peter offers him a Diner's Club Card, the first credit card made for travel and entertainment. 
- Lieutenant Frump mentions the Mayor. 
- Ironically, Murray attacks a red Volkswagen Beetle.
- When the police officers drag Egon from the basement, he jokes about an unpaid parking ticket. 
- In the episode, Ray was still an unlicensed pilot.  
- After Slimer came out of the air lock there was no lever on the panel beind him and Ray.
- ↑ Eatock, James & Mangels, Andy (2008). The Real Ghostbusters Complete Collection booklet, p. 21. CPT Holdings, Inc.
- ↑ Ray Stantz (2009). The Real Ghostbusters - "The Revenge of Murray the Mantis" (1987) (DVD ts. 02:26-02:31). Time Life Entertainment. Ray says: "Since you did a good job, I'll tell you... Peter keeps his jellybeans in a box under his pillow."
- ↑ Egon Spengler (2009). The Real Ghostbusters - "The Revenge of Murray the Mantis" (1987) (DVD ts. 10:05-10:08). Time Life Entertainment. Egon says: "It could have a life energy as high as Gozer's."
- ↑ Winston Zeddemore (2009).The Real Ghostbusters- "The Revenge of Murray the Mantis" (1987) (DVD ts. 10:09-10:10). Time Life Entertainment. Winston says: "Great. Another big Twinkie."
- ↑ Peter Venkman (2009).The Real Ghostbusters- "The Revenge of Murray the Mantis" (1987) (DVD ts. 11:40-11:45). Time Life Entertainment. Peter says: "It means if Darth Vader is willing to loan us the Death Star, we might have a chance."
- ↑ Peter Venkman (2009).The Real Ghostbusters- "The Revenge of Murray the Mantis" (1987) (DVD ts. 12:49-12:50). Time Life Entertainment.
- ↑ Lieutenant Frump (2009). The Real Ghostbusters - "The Revenge of Murray the Mantis" (1987) (DVD ts. 14:19-14:23). Time Life Entertainment. Frump says: "The Mayor isn't too happy with you clowns."
- ↑ Egon Spengler (2009). The Real Ghostbusters - "The Revenge of Murray the Mantis" (1987) (DVD ts. 13:56-13:59). Time Life Entertainment. Egon says: "Look, if it's about that parking ticket..."
- ↑ Peter Venkman (2009). The Real Ghostbusters - "The Revenge of Murray the Mantis" (1987) (DVD ts. 17:26-17:28). Time Life Entertainment. Peter says: "You promised me you'd take more lessons!"
- ↑ Ray Stantz (2009). The Real Ghostbusters - "The Revenge of Murray the Mantis" (1987) (DVD ts. 17:33-17:35). Time Life Entertainment. Ray says: "I'm pretty good for an unlicensed pilot."
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