This Real Ghostbusters t-shirt features an image of the popular class-five full-roaming vapor known as Slimer. On the animated series Real Ghostbusters, Slimer was much more friendly than he appeared in the original 1984 Ghostbusters movie. In the animated series, Slimer bravely distracted the Spectral Ghostbusters until they could be captured by the real Ghostbusters. Afterwards, the Ghostbusters adopted Slimer as a pet.