Samus is said to have an Infrared Ray Scope in the manual for Metroid II: Return of Samus. This predates the introduction and use of her X-Ray Scope, and may be the basis for the Thermal Visor. Despite the description saying Samus can see in the absolute darkness, this is false. Some dark areas in the Metroid games are completely unviewable, including a pitch-black scene in Return of Samus itself. It is possible this was meant to be an upgrade in the game that was later scrapped. No mention of such an item has been made in any further Metroid or related media.
INFRARED RAY SCOPE
"Allows Samus to see, even in the dark."
| Targeting Reticule | Threat Assessment | Radar | Map | Energy Meter | Phazon level | "Heart Monitor"|
Translator Module | Screen-Shot Tool | Sight Window | Scan Point | Infrared Ray Scope
Charge Meter | Missile Counter | Ammo Gauge | Visor Select | Command Icon | Hover Gauge | Aeion Gauge