Slimer

Slimer
Ghostbusters character
Slimer, as he appeared in the film Ghostbusters (1984) and its sequel Ghostbusters: Frozen Empire (2024), made from the authentic molds for the making of the costumes of the films and displayed at the character's co-creator Steve Johnson's Brick and Mortar Productions Studios.
First appearance	Ghostbusters (1984)
Created by	Dan Aykroyd and Harold Ramis (concept) Steve Johnson (design)
Voiced by	Ivan Reitman (Ghostbusters & Ghostbusters II) Adam Ray (Ghostbusters (2016 film)) Frank Welker (The Real Ghostbusters & Cartoon All-Stars to the Rescue) Billy West (Extreme Ghostbusters) Troy Baker (Ghostbusters: The Video Game)
In-universe information
Species	Ghost
Title	Focused, Non-Terminal Repeating Phantasm Class 5 Full Roaming Vapor
Spouse	Lady Slimer (2016 Remake)

Slimer, originally referred to as "Onionhead" and sometimes "the Mean Green Ghost" and "Ugly Little Spud", is a character from the Ghostbusters franchise. He appears in the films Ghostbusters (1984), Ghostbusters II (1989), the remake Ghostbusters (2016), and Ghostbusters: Frozen Empire (2024), in the animated television series: The Real Ghostbusters, Slimer! and Extreme Ghostbusters, and in the video games: Ghostbusters: The Video Game (2009), Beeline's Ghostbusters (2013), Ghostbusters: Spirits Unleashed (2022) and Ghostbusters: Rise of the Ghost Lord (2024). Slimer was voiced by Ivan Reitman and Adam Ray in the films and by Frank Welker in the animated series. In The Real Ghostbusters, he is the Ghostbusters' mascot and friend (unlike the films, where he is a ghost who needs to be busted).

Ghostbusters: Afterlife (2021) instead features a similar ghost named "Muncher".