Slimer in the Machine

"Blast it!" Galvatron screamed into the empty air, "WHY can't you leave me ALONE???!!!"
"I'll NEVER leave you alone," the all-too-familiar high-pitched voice taunted him, "NOT until I get back what is rightfully mine. How ironic that by destroying me, you ensured that I would be a thorn in your side for all eternity!!! Ah, hahahahaha!"
'"STAAAAAAAAAAARRRRRRRRRSCREEEEEEEEEAM!!!!!"

—Galvatron and Starscream

Slimer In The Machine is a Crossover fanfic written by Sheba. Set in Season 3 of Transformers Generation 1, taking place after the episode Ghost in the Machine, it starts with Galvatron being plagued by Starscream's Ghost. Earth-savvy Combaticon Swindle suggests that Galvatron hire The Real Ghostbusters to dispose of his nemesis.

Tropes used in Slimer in the Machine include:

And I Must Scream: Galvatron, when faced with the possibility that he'll be haunted by Starscream forever.
Ax Crazy: Galvatron.
Canon Discontinuity: While Starscream's fate in the G1 episode Ghost In The Machine is not explicitly specified in later episodes, and it's highly suggested that he's the victim of a Bus Crash, he does reappear in commercials as a Pretender.
Covered in Gunge: Well, it does have Slimer in it.
Demonic Possession
Nice Job Breaking It, Villain: Galvatron shoots the trap that Starscream's being held in.
Our Ghosts Are Different
Shout-Out: The title is a reference to the name of the episode from which it was derived, which itself is a nod to this trope.

v t e Works in the Transformers franchise
An incomplete list
Transformers Generation 1	The Transformers (animation) The Transformers (Marvel Comics) Transformers Generation One Dreamwave Transformers: All Hail Megatron Transformers: Last Stand of the Wreckers The Transformers (IDW comic book) Transformers: Robots in Disguise (comics) Transformers: More Than Meets the Eye Transformers: The Movie Scramble City Transformers: The Headmasters Transformers: Super-God Masterforce Transformers Victory Transformers Zone Transformers: Return of Convoy Transformers: Operation Combination Transformers Generation 2
Beast Era	Beast Wars Beast Machines Beast Wars II Beast Wars Neo
Transformers: Robots in Disguise	Transformers: Robots in Disguise (anime)
Unicron Trilogy	Transformers Armada Transformers Energon Transformers Cybertron
Live-Action continuity	Transformers (film) Transformers: Revenge of the Fallen Transformers: Dark of the Moon Transformers: Age of Extinction Transformers: The Last Knight Bumblebee (film) Transformers: Rise of the Beasts
Transformers Animated	Transformers Animated
Fun Publications Transformers continuities	Transformers Timelines Transformers Classics Transformers: TransTech Transformers: Shattered Glass Transformers: Wings of Honor
Transformers Aligned Universe	Transformers: War for Cybertron Transformers: Exodus Transformers: Fall of Cybertron Transformers: Prime Transformers Universe Transformers Rescue Bots
Other Continuities	Transformers: Super-God Masterforce Transformers: Go-Bots Transformers (2004 video game)
Fan Works - Standalone	Black Crayons The Kaceystar Trilogy Lil Formers The Long Road Home Masks (fanfic) The Primus Trilogy Things We Don't Tell Humans Transformers Armada Revisited
Fan Works - Crossovers	Knight of Lolicon (Mega Crossover) Slimer in the Machine (with Ghostbusters) Suburban Senshi (Mega Crossover) Transformers Frontier (with Macross Frontier) Undocumented Features (Mega Crossover)