Necksa, lord and ruler of the sea elementals, strikes out at the air-breathers who have been polluting the oceans. When the Ghostbusters attempt to stop him, Egon, Ray and Winston are swallowed by the creature, leaving Peter to save the day.
Rebecca asks an eager Sam to escort her to a company function to correct a false impression held by her boss.
After Peter's car explodes, the Ghostbusters travel to Detroit's Generous Motors, where the automobile assembly line has been invaded by World War II gremlins, pesky little creatures who like to take apart anything mechanical.
Theo and Cockroach have tickets to appear on television on the dance show "Dance Mania", but are told that only one of them can enter the studio during the filming because of fire laws. Theo miscalculates by offering to let Cockroach go in (thinking he'll refuse) and gets angry when Cockroach takes him up on the offer.
Egon and Slimer switch minds and the timing couldn't be worse, as an egomaniacal ghost named the Master of Shadows (William Marshall) wishes to test his wits against the brainy 'buster', and destroy New York if he fails to measure up.
In the family tradition of "Combustible" Huxtable, Denise is chosen for Hillman's track team, but after a few practices she starts running out of steam.
When Henry's most valuable employee, Stanley, quits his job, Henry tries to find a replacement for Stanley, but to no avail. Punky tells Henry that she needs money to pay her own way into summer camp, so Henry hires Punky, then promptly fires Punky for wrecking havoc in the restaurant, starting a feud between Punky and Henry. Henry believes Punky should have taken the time to learn how to do some of the things that she made mistakes doing, while Punky just wanted to do a good job for Henry.
Harry tries to talk sense to Roz, a recently diagnosed diabetic whose convinced her life is over, and handle a desperate man holding an original draft of the Constitution hostage in the courtroom.
Sir Humphrey makes Jim suspicious of the Minister of Employment when he needs the P.M.’s support in opposing a plan to shift military personnel from the south to the north of England.
Arrested for wiretapping, the Simons seek help from Downtown Brown and find he has been replaced by a tough new chief detective.
Donna and Beano's mother comes for a visit and she falls in love with Kyle.
When Larry and Balki get cable TV, Balki becomes glued to the TV and won't stop watching it to the point where he forgets about his job, sleep, and never goes out anymore. So Larry must make an important decision of getting rid of the cable.
Prodded on by Alexis' incessant questioning, Dana reluctantly explains the reason for her infertility was due to a botched abortion many years before. Suspecting Dana is manipulating Adam to selfishly benefit her own future, Alexis schemes to prevent Dana from legally becoming the mother of Adam's surrogate child. Seeking to undermine Steven's position of power at Denver-Carrington, Adam anonymously informs the press of Skip Maitland's arrest for dealing drugs to players on Steven's football team. This sets off a scandal linked to Blake's campaign. Returning from New York guilt stricken by his weekend affair with Leslie, Jeff hopes to work out his problems with Fallon. But when Fallon walks in on Leslie and Jeff innocently finishing business matters, she is convinced their marriage is over. Concerned by his poor playing performance, Steven requests Josh Harris have a physical. Fearing his drug use will be detected Josh quits the team. After Alexis informs Sean of Dana's ill-fated abort
While Henry is closing his studio for the day, he is approached by Matt Glossy, the owner of Glossy's, which is a multi-million dollar empire of photography stores. Glossy admits that his real name is Sam Glossy, and that the name "Matt Glossy" sounded better to use for business. Glossy wants to open a new branch of Glossy's in the mall that Henry's studio is in, and Glossy thinks Henry's studio is in the spot Glossy is looking for, so Glossy offers to buy Henry's studio for $100,000 so he can turn it into a branch of Glossy's. Henry accepts the offer and Glossy hires Henry as the manager of this branch of Glossy's. Henry, who has been a photographer for 43 years, feels so miserable working as the manager that he ends up quitting. Punky convinces Henry to take some of the $100,000 he got from Glossy and open up a new restaurant. Since it was Punky's idea, Henry names the new restaurant "Punky's Place".
The rise and fall of Magnus Pym and his career through intelligence. From chance meetings with people will be important to him in the future to a life in Czechoslovakia, Pym weaves his way through the complicated world of espionage.
A paranormal convention comes to town, but when the Ghostbusters are called into action, they are forbidden by the hotel's manager from using their technology for fear of disturbing another group… a convention for dentists!