Iron Galaxy and many other teams helped out.
If you were wondering how Nintendo was able to release a remaster of Metroid Prime while the fourth major entry is still in development, it turns out it was a team effort.
The credits of Metroid Prime Remastered reveal Retro Studios was assisted by Iron Galaxy - the same developer behind a number of other Switch ports such as The Elder Scrolls V: Skyrim, Diablo III and Overwatch. The American-based studio has also been heavily involved with the Xbox version of Killer Instinct.
Read the full article on nintendolife.com