**Trader sentiment for the "Avengers: Doomsday" Rotten Tomatoes score centers on pre-release anticipation for the December 18, 2026 release.** Prediction markets like Kalshi have held steady in the low-to-mid 80s since opening earlier in 2026, reflecting confidence in the Russo brothers' direction, Robert Downey Jr.'s casting as Doctor Doom, and the expansive ensemble featuring the Fantastic Four, X-Men, and returning MCU heroes. Recent promotional activity, including extended footage screened during "Avengers: Endgame Encore" events and new trailers, has sustained momentum without major negative signals. Historical benchmarks from prior Avengers entries (Infinity War at 85%, Endgame at 94%) and the film's multiverse-scale narrative support expectations of a Certified Fresh outcome above 75%, though outcomes remain sensitive to final critical reception once reviews drop. Upcoming catalysts include further marketing pushes and any late casting or plot teases before wide release.