UFO Chase is a mission in Free Ride Extreme. It can be started in the northern part of the Works Quarter. The objective is to pursue an alien from outer space. The alien will attempt to escape in a UFO. The only 'difficult' part of this subquest is that it needs good and fast driving, in order to be able to keep up with the UFO. But actually, don't worry if you lose it from your sight - you just need to look which direction it went and then you can find it by its sound. It will always wait for you until you reach it, no matter how long it takes you, and will only start moving after you get close enough. That is why there is a timer in this mission - you cannot afford to search it forever - but there is quite plenty of time. The mission will end next to the Lost Heaven Lighthouse, where a bonus car (Mutagen) is 'beamed down' by the UFO.