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

The builders embrace the Wild West and their technical abilities by creating bull-riding characters.

The builders make their childhood dreams come true by building an imaginative treehouse with their younger selves in mind.

Man's best friend in bricks! Each team races to pick which furry friend they'll recreate.

The teams have just eight hours to create a pirate ship with a creative and cohesive story about its captain and the treasure they're in search of. At the end of the challenge, the builders dock their ships to 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.

Each team must transform a putting green into a playable mini golf hole.

The contestants build tall, strong and stylish castles using only regular bricks.

The teams recreate iconic action-packed scenes from the Marvel Cinematic Universe.

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

The teams have 10 hours to build a fountain that uses water to create movement within their build.

The three remaining teams get 24 hours to build their best creation possible.

Robin Thicke, Finesse Mitchell, Leslie Jordan and Cheryl Hines build aerodynamic snowmobiles.

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.