How do you refer to an item that was released earlier, but takes place after a "prequel"?
"Sequel" gives the clear implication that it was released after, this is not what I want.
In some cases "Original" applies, but that only works if the [word I want] was the first. Which isn't always the case.
"Caprica" is a prequel series to the "Battlestar Galactica" reboot released circa 2005.
But when talking about "Caprica", you can't just refer to that specific earlier work as the original "Battlestar Galactica", because the original was released in 1978, and Caprica isn't really a prequel to the original.
"Lego City Undercover: The Chase Begins" is a prequel to the "Lego City Undercover" game for the Wii U, in this case "Original" probably refers to the aforementioned Wii U game, but might refer to the first Lego City game, or the first modern Lego, one could say "The original Lego City Undercover", but it is quite wordy, and due to the similarities in name might be a little confusing.