A trilogy that revived the series
Before The Release of Wolfenstein: The New Order, there were only three main individual games that defined what Wolfenstein was - Wolfenstein 3D, Return to castle Wolfenstein and Wolfenstein 2007.
Then Machinegames came with the avard winning Wolfenstein: The new order, continued by the prequel Wolfensten: The old blood, and finished with New Collosus. I don't mention Youngblood as it's an insult to the series and community.