The builders must make pet palaces for kittens.

The builders must skillfully construct a scene inspired by their chosen biome while including an explosion and a compelling narrative.

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.

The pairs are tasked with creating a roller coaster that incorporates a mechanical lift and a drop.

Counting down the top 100 moments from four seasons of "LEGO Masters."

The three remaining teams must create a massive build complete with storytelling and creativity.

Returning fan-favorites contestants David Guedes, Caleb Schilling, Krystle Starr and Randal Wilson, and celebrities NeNe Leaks, Marshawn Lynch, Kelly Osbourne and Rob Riggle pair together to compete in holiday-themed challenges.

Returning fan-favorites contestants David Guedes, Caleb Schilling, Krystle Starr and Randal Wilson, and celebrities NeNe Leaks, Marshawn Lynch, Kelly Osbourne and Rob Riggle pair together to compete in holiday-themed challenges.