Unfortunately what I do remember about this game is extremely abstract and will probably not jog anyone's memories, however I figured that I should give this a shot. Basically what I do remember is that I believe this game with my windows computer. i'm pretty sure it ran in DOS mode. the game started out with about a two minute introduction. in this you would see two aliens (one green, one purple). they were roughly the shape of traffic cones with three holes running vertically along their front.
the storyline goes something like this: the purple alien somehow becomes evil, and after a series of *forgotten* events turns the plot into something that has to do with time travel achieved by what look like porter potties.
also, if it helps, distinct scenes that i remember: - in the introduction, you see a car going very fast towards something (i think it was red?) and also, when you first start playing the game you are able to interact with someone that is trying to break into a car, then after you are able to walk towards the stream where the aliens were first introduced in the introduction.
i know all of this sounds extremely random and bland, and most likely stupid. however, i've been searching for this game. it's been about ten years since i've played it, however it's always fun to take a trip to way back when