Knock, Knock is an episode of the television series The Real Ghostbusters. It first aired September 14, 1987.
Plot[]
When a group of subway construction workers accidentally uncover an ancient door that is not meant to be opened until doomsday, their persistence accidentally triggers the door's opening, which sends incredible amounts of poltergeist energy surging through the New York subway system, mutating the trains into worm-like monsters.
The Ghostbusters are called in to deal with it, and Egon discovers that if they don't close the door soon, the entire world will be transformed into a twisted and barren wasteland of ghostly and demonic creatures that will replace all of humankind and civilization.
| The Real Ghostbusters TV series | ||
|---|---|---|
| Season 1 | Ghosts R Us • Killerwatt • Mr. Roger's Neighborhood • Slimer, Come Home • Troll Bridge • The Boogieman Cometh • Mr. Sandman, Dream Me a Dream • When Halloween Was Forever • Look Homeward, Ray • Take Two • Citizen Ghost • Janine's Genie • Xmas Marks the Spot | |
| Season 2 | Knock, Knock • Station Identification • Play Them Ragtime Boos • Sea Fright • The Spirit of Aunt Lois • Cry Uncle • Adventures in Slime and Space • Night Game • Venkman's Ghost Repellers • The Old College Spirit • Ain't NASA-Sarily So • Who're You Calling Two-Dimensional? • A Fright at the Opera • Doctor, Doctor • Ghost Busted • Beneath These Streets • Boo-Dunit • Chicken, He Clucked • Ragnarok and Roll • Don't Forget the Motor City • Banshee Bake a Cherry Pie? • Who's Afraid of the Big Bad Ghost • Hanging By a Thread • You Can't Take It With You • No One Comes to Lupusville • Drool, the Dog-Faced Goblin • The Man Who Never Reached Home • The Collect Call of Cthulhu • Bustman's Holiday • The Headless Motorcyclist • The Thing in Mrs. Faversham's Attic • Egon on the Rampage • Lights! Camera! Haunting! • The Bird of Kildarby • Janine Melnitz, Ghostbuster • Apocalypse—What, Now? • Lost and Foundry • Hard Knight's Day • Cold Cash and Hot Water • The Scaring of the Green • They Call me MISTER Slimer • Last Train to Oblivion • Masquerade • Janine's Day Off • The Ghostbusters in Paris • The Devil in the Deep • Ghost Fight at the O.K. Corral • Ghostbuster of the Year • Deadcon I • The Cabinet of Calamari • A Ghost Grows in Brooklyn • The Revenge of Murray the Mantis • Rollerghoster • I Am the City • Moaning Stones • The Long, Long, Long, Etc. Goodbye • Buster the Ghost • The Devil to Pay • Slimer, Is That You? • Egon's Ghost • Captain Steel Saves the Day • Victor the Happy Ghost • Egon's Dragon • Dairy Farm • The Hole in the Wall Gang | |
| Season 3 | Baby Spookums • It's a Jungle Out There • The Boogeyman Is Back • Once Upon a Slime • The Two Faces of Slimer • Sticky Business • Halloween II 1/2 • Loathe Thy Neighbor • The Grundel • Big Trouble With Little Slimer • The Copycat • Camping It Up • Transylvanian Homesick Blues | |
| Season 4 (Now titled "Slimer! and the Real Ghostbusters") | The Joke's on Ray • Flip Side • Poultrygeist • Standing Room Only • Robo-Buster • Short Stuff • Follow That Hearse • The Brooklyn Triangle | |
| Season 5 (Now titled "Slimer! and the Real Ghostbusters") | Transcendental Tourists • Something's Going Around • Trading Faces • Elementar My Dear Winston • Slimer's Curse • Partners in Slime • Til Death Do Us Part • Three Men and an Egon • Kitty-Cornered • If I Were a Witch Man • It's About Time • The Halloween Door • Jailbusters • Surely You Joust • Future Tense • Venk-Man! • Loose Screws • The Ghostbusters! Live from Al Capone's Tomb! • Revenge of the Ghostmaster • Slimer Streak • The Ransom of Greenspud | |
| Season 6 (Now titled "Slimer! and the Real Ghostbusters") | Janine, You've Changed • You Can't Teach an Old Demon New Tricks • The Haunting of Heck House • Ghost World • Mean Green Teen Machine • Spacebusters • My Left Fang • Russian About • The Slob • Deja Boo • Afterlife in the Fast Lane • Guess What's Coming for Dinner • Stay Tooned • Very Best Friends • Busters in Toyland • The Magnificent Five | |
| Season 7 (Now titled "Slimer! and the Real Ghostbusters") | The Treaure of Sierra Tamale • Not Now, Slimer! • Attack of the B-Movie Monsters • 20,000 Leagues Under the Street | |
| Slimer! sub-series | Slimer for Hire • Cruisin' for a Bruisin • Nothing to Sneeze At • A Mouse in the House • Cash or Slime • Doctor Dweeb, I Presume • Quickslimer Messenger Service • Pigeon-Cooped • Go-Pher It • Scareface • Sticky Fingers • Don't Tease the Sleaze • Room at the Top • Tea But Not Sympathy • Special Delivery • Out with Grout • Dr. Strangedog • The Dirty Half-Dozen • Movie Madness • Slimer's Silly Symphony • Little Green Sliming Hood • Monkey See, Monkey Don't • Beach Blanket Bruiser • Class Clown • Dog Days • Up Close and Too Personal • Sweet Revenge • Rainy Day Slimer • Slimer & the Beanstalk • Space Case • Show Dog Showdown • The Not-So-Great Outdoors • Unidentified Sliming Object | |