UFO was a Ford monster truck owned by Robert Fisher out of Pennsauken, New Jersey, which ran from 1991-96 as the teammate to his Liquidator monster truck. The truck was on the back cover of There Goes a Monster Truck, but wasn't featured in the video. It is possible that scenes were filmed, but later cut from the final release.
The truck's first chassis had a combination of leaf spring suspension as well as 4-link suspension and long-travel shock absorbers, essentially making it a Stage 2.5 truck. The truck's second chassis was a more conventional Stage 3 build with Kuster coilover shocks instead of leaf springs, with the chassis itself inspired heavily by Marty Garza's Maximum Overkill. Both versions of the truck ran Rockwell F-106 planetary hybrid axles with Clark planetary ends. This truck would become Liquidator 3 and eventually John Seasock's Sudden Impact.
In 2025, the truck is planned to return under Brandon Robbins with a new blue design made by Jam Customs.