Space Quest is a very famous adventure-series made by Sierra. Instead of a stallward hero, players have to deal with space-janitor Roger Wilco to master the adventures.
In the fourth part "The Time Rippers", Roger is being attacked by his arch enemy Vohaul, who was presumed dead, and has landed in a post-apocalyptic future of his home after several implications. Hunted by the merciless Sequel Police, he has got to find out what terrible catastrophe had occured. At that, he is being involved very personally, too...
After the first installment of the series had already been very liable to lawsuits, the fourth part continued this tradition.