Ted (Keanu Reeves) and Bill (Alex Winter) are classmates in the same high school, and they have a very good relationship. Perhaps the reason why they hit it off so well is that their IQ is at the same level, that is, the level lower than everyone else. To make matters worse, Bill and Ted only knew how to idle around all day long and didn't focus on their studies. You can imagine their results. The history exam was coming soon. At this juncture, Ted and Bill learned a shocking news. If they couldn't pass the exam, they would not be able to get their graduation certificates. The two of them were suddenly confused and at a loss. Just then, an extraterrestrial visitor named Rufus (George Carlin) appeared in front of them. He claimed to be from the future world. Whether Rufus was telling the truth or not, Ted and Bill knew that he was the only lifeline for their diploma.