Sue Perkins hosts an epic snow-building competition from a snowy Alpine mountainside.
Johnny Vegas, Laurence Llewelyn-Bowen, Dani Dyer, Liam Charles and Cherry Healey go head-to-head across three tough rounds that challenge them to build incredible structures from tonnes of snow and ice.
Supported by world-class ice sculptors, engineers and snow builders, our stars must design and make some of the most extraordinary snow creations ever seen on TV.
The competition culminates in the ultimate snowy challenge, where the famous faces use everything they've learned in each round to attempt to construct the greatest snowman.
The Greatest Snowman airs Christmas Eve on Channel 4.