Malachi (also spelled Malachai) is a ghost in "Play Them Ragtime Boos." He was the ghost of a jazz musician who wanted to turn time back to when he was alive and famous with his music (he constantly played "When the Saints Go Marching In"). Stranded without their equipment, the Ghostbusters banished his spirit by playing rock and roll to cancel Malachi's music.
Malachi was once a famed trumpet player based in Muddy Flat, Louisiana. He died in 1942. However, his spirit was restless and latched onto a belief that the town needed to be restored to its glory days, the 1920s, when America was experiencing the Jazz Age. In the mid-1980s, at 12 midnight every night, Malachi and several band mates began to create enough magic music to push back time and accomplish their goal. The oscillations produced also ensnared people with a greater aptitude for music, including Ray Stantz.
The Ghostbusters happened to stay overnight in Muddy Flat while in route to the International Para-psychological Expo at Tulane. The time slip phenomena created by Malachi presented a dire scenario, creating a world without progression. Egon Spengler proposed creating a counter-oscillation when makeshift equipment failed them. The Ghostbusters then translated the anti-distortion vibrations into musical notation and programmed them into musical instruments. They confronted Malachi and challenged his jazz with something more primal: rock and roll. The plan worked and Malachi was dispersed.
Malachi's greatest power is his ability to manipulate space-time. This task is accomplished through music. It affects the local fabric of the space-time continuum. Everything within this locality is changed. Buildings and architecture revert to its previous design. Clothing on people also changes to its period counterpart. The music also appears to remotely possess people who have some talent in the field of music and forces them to dance without pause.
Malachi demonstrated the ability to send interfering mortals, in this case the Ghostbusters, as far back as to pre-historic times, where they encountered a Megalodon.
Ritual powder from Marie Cuttie who is a Mambo, priestess of Voodoo, has been proven to temporarily defeat Malachi. However, the absolute solution to defeat him was with counter-oscillations played through rock and roll music.
- In Ghostbusters Issue #2 page 12, the T-Shirt worn by Bradley Sunderland references Malachi and "Play Them Ragtime Boos".
- On page one of Ghostbusters Issue #10, Malachi makes a non-canon cameo as one of the musicians.
- On Cover B of Ghostbusters Issue #10, Malachi makes a non-canon cameo in the second E.