Board Thread:General Discussion/@comment-34147304-20180110000100/@comment-24922135-20180110004657

Aliens not already unlocked by Ben can be scanned to unlock them. If Merlinisapien DNA was not already present in the database, the Omnitrix would've locked Ben out of his transformations until it could scan Prisoner 775. Since Ben scanned Prisoner 775 AFTER defeating him using Omnitrix transformations, it is safe to assume Merlinisapiens come from the Milky Way Galaxy.