Plot
The film opens with Clutch Powers tunneling underground to find a Power Crystal, which awakens the Crystal King, a rock monster. After a chase, Clutch realizes the crystal he was carrying is actually the king’s baby, and returns it. As a reward, the Crystal King gives him a Power Crystal. Clutch then returns to Lego City and hands the crystal to his boss, Kjeld Playwell, who assigns him a team: Brick Masterson, a firefighter; Peg Mooring, a biologist; and Bernie von Beam, an engineer. Playwell informs them about an incident on the Space Police prison planet.
Clutch and his team arrive at the prison planet and investigate, despite Clutch’s preference for working alone. They are attacked by an unseen wizard, Mallock the Malign, who escapes with two criminals. The team frees the Watch Commander, who explains that all ships’ spark plugs have been removed to prevent escapes. The criminals steal their ship and destroy the others. The team struggles to cooperate, leading Clutch to build a new ship on his own.
Clutch later claims responsibility for the failure, admitting he was distracted by a symbol referring to one of the criminals, Omega. Playwell tells them that Mallock terrorized the medieval planet Ashlar before being imprisoned. Ashlar’s former king, Revet, sacrificed himself to protect the kingdom and his son, Prince Varen, who is now expected to rule, despite his lack of battle skills. Playwell orders Clutch’s team to capture Mallock on Ashlar.
Arriving on Ashlar, the team accidentally destroys Lego-Henge and seeks refuge in an abandoned mine. They discover Mallock controls the planet with an army of skeletons and goblins. Clutch leaves to find Prince Varen and convince him to help fight Mallock. Meanwhile, Peg, Brick, and Bernie build a battle chariot. Clutch encounters Hogar, a troll, who demands answers to three riddles before allowing him to cross a bridge. Skelly and Bones, Mallock’s skeletons, catch up with Clutch, but Hogar helps him escape. He shares the history of Prince Varen’s father and his golden sword, which is key to defeating Mallock.
At the castle, Clutch finds Varen, but the prince is reluctant to fight Mallock, admitting he feels unqualified. Disappointed, Clutch returns to the camp, where a dwarf named Lofar offers help. Eventually, Varen and his knights agree to join the fight.
Clutch and Varen sneak into Mallock’s castle disguised as Peg, but Mallock traps them in a bone cage. Meanwhile, Brick, Peg, Bernie, and Hogar fight off the skeletons. Hogar brings the chest containing the golden sword, but it’s empty. After receiving a message from Clutch, Bernie rallies the team to rebuild the chariot. They regroup with the knights and battle the skeletons. Peg summons the dragon she befriended earlier to destroy the bone cage, freeing Clutch and Varen. Varen retrieves the golden sword and gains the courage to face Mallock, realizing he must protect his kingdom.
Mallock tries to trick Clutch into giving him the sword by promising to reveal his father’s location, but Clutch refuses, declaring he’s already found him. Varen uses the sword to defeat Mallock, trapping him with a glowing chain. Skelly and Bones fight Brick, but Bernie helps him defeat them. Varen overpowers Mallock with the sword’s power, trapping him and declaring himself King of Ashlar.
After Mallock’s defeat, Hogar is freed, and the skeleton army dissolves. The team celebrates, and Varen is officially crowned king. Clutch’s team transports Mallock back to Lego City, where Playwell praises their efforts. However, the team’s mission is still not over, as the other two criminals are still on the loose. Play well informs of the next criminal Squidman and they prepare for their next adventure.
