I just woke up so my dream is a bit more vivid to me.
The setting kept changing, from night or day. I was in this armored car thing with my little sister, but it kind of looked like a homemade go-kart/dune buggy that someone would use in the desert. We were being chased at night time by that fish character from Undertale, Undyne I think it's called? Anyway she chased us all night in her own car until it was night time. The roads were paved, but very hilly and there was a lot of forest around. Our car was starting to run out of gas, but we reached a hill. My sister scrambled to put the car into neutral and we sped down the hill. Undyne was catching up to us, but there was a mounted turret on the back of the car we were in. My sister manned the gun while I drove. The drivers seat was on the wrong side of the car (british style) but we drove on the normal side of the road. Everything was also really black because it was night time, but all shiny in our headlights like it was wet and had been raining. My sister eventually gunned Undyne down as she got closer. She was laying there dying in her wreckage, and we turned the car around somehow, and my sister shot at her more until she didn't move anymore. By then it was day time, the trees were green and dry. We suddenly had our two dogs and started to walk home. There was something of a confusion with one of the dogs and a fence, and that's when I woke up.