Sierra On-Line, 1991
In this fourth installment everyone's favorite janitor, Roger Wilco, is back in full 256-Color glory. He must save the universe yet again, this time without even knowing what the hell the universe needs to be saved from. Time Rippers opens with the hapless Roger stopping in a bar for a quick drink, only to find himself teleported through time to Space Quest 7. To save his reality, Roger must quest across various timelines and Space Quest games in order to discover, then complete, his mission. This is undoubtedly the strangest of the series, but features very nice graphics, good music and an interesting plot (once you figure out what the hell is going on, that is). Don't miss this one!