Peter has gotten a new stereo, but when he starts listening to it, he starts levitating and explosions start happening. Ray and Winston enter, having heard the commotion, and Egon and Ray conclude that the singer must be a banshee because she's Irish. They explain that banshees sing, and their songs always cause disaster, but they've never gone commercial before. Peter reveals that the singer, Shanna O'Callahan, will be having a concert that will broadcast throughout America, which would be bad news for Americans if she is a banshee.
The Ghostbusters go to the concert hall, where there has been a bit of disaster (such as a ceiling turning into a bat). They tell Shanna's agent that she's a banshee but he doesn't believe them and shoos them away. They find a musical rehearsal hall next to a blown-up building, so they enter. After a run-in with a riled-up janitor, they ask a punk guy about Shanna.
He directs the Ghostbusters to her, and she sings at Peter, making him almost fall through the ceiling, which proves that she is indeed a banshee. It turns out that Shanna also made Peter fall in love with her, which is revealed when he calls her beautiful and steals a poster of her. Then, he has an imagination sequence about making a music video with her.
The Ghostbusters coax Peter into the concert hall with them, only to find all the men there have also been brainwashed by Shanna. Winston, Ray, and Egon trick Peter by offering him to "meet" Shanna. They have him go into her dressing room, and then break in under the guise of protecting her from something "strange". Once there, Shanna sings and ties up Peter, then morphs into a monster when near a mirror.
The rest of the Ghostbusters untie Peter, who's now no longer in love with Shanna, and go to the concert. When Shanna sings, giant spiders appear, which the Ghostbusters trap. Egon remembers that mirrors make Shanna revert to a monster, so he changes the controls to reflect her voice back, which turns her back into a monster. They trap her, and then the agent (Vincent Brag) offers to make Peter a rockstar.
This episode provides examples of
- All Part of the Show: The audience claps and cheers at the various mishaps during the concert, and then at Shanna being trapped, implying they think it's part of the concert.
- Bat Out of Hell:
- Apparently, someone's ceiling turned into a giant bat, who flew away with some musicians.
- At the concert, Shanna creates some bats.
- Breaking the Fourth Wall: The fantasy sequence ends with Egon explaining to the audience that it's all in Peter's mind.
- Brown Note: Zigzagged for banshees' songs — they always cause something bad to happen, but it's only to a person half the time; it may also cause destruction of objects.
- Chewing the Scenery: Egon and Slimer hide under Egon's bed, they hate Peter's music so much.
- Comedic Underwear Exposure: The cursed music leads to Ray's clothes falling off, leaving him in his skivvies.
- Comically Missing the Point: When a man is talking so someone on the phone whose ceiling turned into a giant bat and flew off with the musicians, he says, "Just call the union and get some more!" They think he meant more bats.
- Companion Cube: Egon named his computer ("Marsha") and Peter talks to his stereo like it's his girlfriend.
- Creating Life: Shanna can make animals appear.
- Disney Acid Sequence: Justified since it's in Peter's imagination, but the music video involves swirling colours and floating televisions.
- Don't Call Me "Sir": Subverted — the Ghostbusters call Vincent Brag "Mr. Brag", but then he asks to be called Vince. However, when he thinks they're lying, he changes his mind and asks to be called Mr. Brag after all.
- Fantasy Sequence: Peter imagines making a music video with Shanna.
- Funny Phone Misunderstanding: A guy says over the phone, "So what if your ceiling turned into a giant bat and flew away? ... So what if it flew off with all the musicians? Just call the union and get some more! No, not bats, you idiot, musicians!".
- Giant Spider: Large spiders show up as the result of Shanna's singing.
- Hypocritical Humour: Egon berates Peter for spending a lot of money on a stereo, despite spending a lot on a computer himself.
- Interspecies Romance: Invoked — banshees can make human men fall in love with them.
- Involuntary Shapeshifter: Reflections make Shanna turn from her woman form back into her default monster form.
- Magic Music: Banshees' music causes various disasters to happen whenever it's played.
- Mistaken for Clown: The guy at the front desk mistakes the Ghostbusters for acrobats.
- Mourning an Object: When the head burns off a ventriloquist's dummy, the ventriloquist bursts into tears.
- Mystical White Hair: One sign Shanna is not human is her white hair.
- Not So Stoic: Egon hides under his bed from Peter's music.
- The Pratfall: When the Ghostbusters fall after being chased out of the building, Ray lands on his behind.
- Slapstick: When the Ghostbusters are shooed out of the building, they fall ungracefully onto the sidewalk.
- Smart Ball: It's Peter of all characters who suggests they get evidence before concluding that O'Callahan is a banshee.
- Snarking Thanks: Winston ironically "thanks" Egon for pointing out that America could be destroyed.
- Stuff Blowing Up: When Peter listens to his stereo, random things explode.
- Voluntary Shapeshifting: Shanna can shapeshift between monster and woman.
- White Hair, Black Heart: Shanna is an evil, white-haired banshee who causes destruction and forces Peter to fall in love with her.
- You Need a Breath Mint: Winston complains about being able to smell garlic on Slimer's breath.
