Watch: One team's build survives the Coaster Cart while the others come to a crashing ending
It turns out building rollercoaster carts is just as scary as riding in them.
In Episode 4 the teams were tasked with a two-part challenge and the first part – the Coaster Cart challenge – required teams to decorate a remote control cart.
Stream every episode of LEGO Masters for free on 9Now.
But it didn't stop there, as part of the judging process the contestants had to test their rollercoaster carts on a test track.
The goal? To see if they could survive the ups and downs of the ride.
The result was catastrophic for most pairs with just one team's build remaining unscathed. Watch the moment every LEGO creation crashed or cruised in the video above.
The Coaster Challenge has Alex on edge. Nine
Scott and Owen tried to set themselves apart with their Spinning Teacup build.
They hoped a spinning mechanism would give them a competitive edge but instead it gave them too much momentum and sent the teacup flying off the track.
David and Gus' Crazy Clown Cart took a nose dive as it rolled down the first dip of the track.
And while some of the bricks were knocked off in the process it remained firmly on the track and managed to stay firmly on the roller coaster.
READ MORE: Here's which team got eliminated from the LEGO Masters Grand Masters competition tonight
Scott and Owen look at what's left of their Spinning Teacup. Nine
Alex and Caleb's Burger build wasn't afforded the same fate and propelled itself off the rollercoaster within seconds.
As did Andrew and Damian's Rocket Snail creation.
EXCLUSIVE: Andrew and Damian reveal why they 'want to make Brickman cry'
Andrew and Damian watch on as their build is smashed to smithereens. Nine
"Disaster, but well done," Hamish applauded the team's dramatic smash.
But one team's creation managed to cruise along the rollercoaster tracks completely unharmed.
To find out which team the build belonged to watch the video at the top of this article.
LEGO Masters Grand Masters airs on Sunday at 7:00pm and Monday and Tuesday at 7:30pm on Channel 9 and 9Now. Stream every episode of LEGO Masters for free on 9Now.