The daring duos embark on a mission to construct the ultimate motorized party boat that showcases their unique personalities.

The builders must make pet palaces for kittens.

Contestants have twelve hours to create volcano-centered scenes with explosive potential.

The builders must choose from a selection of sound effects and transform what they think their sound would look like into a LEGO model.

The duos divide into two big teams to construct a mesmerizing show consisting of four breathtaking acts.

The builders ransack a detective's office and leave with an item of their choice that they must replicate into a one-to-one scale model; "LEGO Masters" Season 3 winner, Stacey Roy, must play detective and spot which items are real.

Teams must make luxurious bags that are both functional and runway-worthy by showcasing their creations in a photo shoot; show-stopping bags secure a coveted magazine cover and the fashion fails are at risk of elimination.

Teams use bricks to create an off-road remote-controlled vehicle for an ultimate race.

Buckle in tight! The four remaining pairs are tasked with creating a roller coaster that incorporates a mechanical lift, a drop, and imagination that reaches new heights. Within 12 hours, the teams must create a coaster that is technically sound and have an aesthetically pleasing theme throughout the build. Only three teams will ride into the finale.

Will Arnett counts down the top 100 moments from all four seasons of "LEGO Masters".

The three remaining teams have 24 hours to create a massive build complete with storytelling, creativity and technical aspects to claim the title as LEGO Masters. The team that pushes their creativity and skills to the limit and creates a show-stopping build will take home a 0,000 cash prize, the ultimate LEGO trophy and the grand title of LEGO Masters. And for the first time in the show's history, the winning build will be transformed into a set and displayed at a LEGO flagship store.

Special guests pair up with former contestants to compete in ingenious holiday-themed challenges.

Special guests pair up with former contestants to compete in ingenious holiday-themed challenges.