Snow hisses to steam as a chain of geysers tears through the valley—winter just hit its boiling point! Manny scrambles to steer the herd to higher ground, Sid opens a “spa” that’s really a hot‑mud disaster , and Diego pretends he’s not afraid of scalding bubbles .

Buck (Pegg) rockets in, claiming a magma “beast” is burrowing under the ice. Cue splashy set pieces: geyser‑surfing on a turtle shell, a hot‑spring canyon hop, lava‑raft chaos, and an earthquake conga with Granny yelling directions.

Scrat, of course, wedges the acorn into a steam vent and turns the sky into a popcorn maker. Colors glow sunset‑orange against glacier blue; jokes fly faster than steam bursts; heart lands where family finds cooler heads together.