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Disney Unveils Rainbow Caverns Scene in Big Thunder Mountain Overhaul, Sets 2026 Return

New concept art previews a darker underground moment, signaling a refreshed narrative before the 2026 return.

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Big Thunder Mountain Railroad
Walt Disney World

Overview

  • Disney confirmed the Magic Kingdom coaster will reopen in 2026, with no specific date announced.
  • Official details introduce Rainbow Caverns featuring phosphorescent pools and iridescent stalactites and stalagmites, described as beautiful but menacing with a deep rumble.
  • The updated story re-centers on prospector Barnabas T. Bullion and the mountain pushing back against his gold rush ambitions.
  • Disney calls the project a “mountain-top to cavern-deep” refurbishment, and outlets report replaced track along with new lighting, effects, and other updates to scenery and vehicles.
  • Concept art and first scene notes were released August 21, with Disney saying further updates will follow as work and testing continue.