A game pitched by Metroid Prime developers at Retro Studios concluding the release of Metroid Prime 3 as a new direction to head into following the conclusion of the trilogy of Prime games. It was proposed to be similar to the XCOM series of video games that reused assets from the Trilogy games. However, management at Retro Studios rejected the pitch.

Nintendo comments on controversial decision to feature Galactic Federation troopers in Metroid Prime 4 - Nintendo Everything
Nintendo Everything · 1/3/2026

The XCOM-Style Metroid Game That Never Saw The Light Of Day - svg.com
svg.com · 12/9/2022
The XCOM-Style Metroid Game That Never Saw The Light Of Day - www.svg.com
www.svg.com · 12/9/2022

Metroid Prime developer pitched XCOM-style spin-off - Eurogamer.net
Eurogamer.net · 12/6/2022

Former Retro Studios Dev Reveals "Rejected" Wii Pitch Metroid Tactics - Nintendo Life
Nintendo Life · 12/4/2022
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