Teams are introduced and tasked with a space-themed challenge...building personalized spaceships.

The contestants bring dinosaurs and special effects to life in their "Jurassic World: Dominion"-inspired builds; actor Chris Pratt makes a guest appearance.

The builders embrace the Wild West and their technical abilities by creating bull-riding characters, which are tested when the characters saddle up on a mechanical bull with 10 levels of intensity.

The builders make imaginative LEGO treehouses in real trees, with no built-in support.

The teams have 8 hours to create a pirate ship with a creative and cohesive story about its captain and the treasure they seek; the builders see how their creations hold up against the rest of the fleet.

The teams put an imaginative and dynamic twist on a summer camp theme by using power functions in their builds; the team with the most creative build blindly picks a prize and chooses another pair to receive what was left.

The contestants face off in a mini golf challenge; each team must transform a putting green into a playable mini golf hole, complete with obstacles that propel the ball and the story within the build.

The contestants build tall, strong and stylish castles using only regular bricks; a wrecking ball that ultimately decides the best execution of the challenge.

The remaining five teams fight to stay in the competition as they recreate iconic action-packed scenes from the Marvel Cinematic Universe.

Contestants are split into red and blue teams, where they compete to build a fast and fashionable race car.

The semi-finalists have 10 hours to build a fountain that uses water to create movement within their build; the 3 remaining teams get 24 hours to build their best creation possible.

Celebrity contestants Robin Thicke, Finesse Mitchell, Leslie Jordan and Cheryl Hiness build aerodynamic snowmobiles that will shoot off a snow jump.

The teams must build Santa a new sleigh that looks great and is tough enough to span across two chimneys filled with heavy holiday gifts.

The teams compete in two super-sized brick-building challenges; the winning team wins $20,000 for the charity of its choice.