The Lego Movie 2: The Second Part

Spoiler alert! Please do not read the following plot summary if you have not seen the film.Five years after the events of Master Builder Emmet's previous adventure, Finn's younger sister Bianca has started taking some of his LEGO creations and other toys in their basement along with her own set of Duplo bricks to play with. Metaphorically, in the LEGO universe, the Duplo invaders have turned Bricksburg into a post-apocalyptic wasteland named Apocalypseburg and continue to invade periodically, which in turn hardens most of Apocalypseburg's citizens. Emmet remains upbeat and wants to move into a dream home with Lucy, but is troubled by dreams of a pending "Armamageddon".

The Duplo army leader General Sweet Mayhem arrives in Apocalypseburg, and proclaims that Queen Watevra Wa'Nabi of the Systar System wants to marry Batman. Mayhem's forces kidnap Batman, Lucy, Benny, MetalBeard, and Unikitty, taking them to the Systar system. Batman is taken to Wa'Nabi and eventually agrees to marry her, while the others are placed in environments designed to tempt them, which only Lucy resists.

Meanwhile, Emmet converts his dream house to a spaceship to give pursuit. En route, he is saved from colliding with an asteroid field by the rugged adventurer Rex Dangervest. As they travel to the Systar system, Emmet begins to absorb several of Rex's mannerisms and hopes to impress Lucy with his hardened attitude. The two evade capture by Wa'Nabi's forces and join with Lucy. Rex devises a plan to rescue Emmet's friends, which involves Lucy switching off the pop music brainwashing the others and Emmet destroying the reception cake encased in a temple to stop the wedding. As Lucy fights Mayhem to get to the music she learns that the Systar System never intended to be antagonistic towards Apocalypseburg, but instead sought peace between them and simply failed at communicating so. Lucy realizes that Rex is tricking Emmet and tries to stop him from destroying the temple, but fails as Emmet is swayed by Rex's manipulations. The destroyed temple creates a hole in the LEGO universe, and Wa'Nabi warns them that the armamageddon has arrived.

In the real world, the act of destroying the temple is represented by Finn angrily destroying Bianca's LEGO creations. Hearing them bicker, their mother orders them to put the LEGO toys into storage, this event being Armamageddon (as in "Our Momma Gets In"). Emmet tries to stop them but is stopped by Rex, who reveals he is an embittered version of Emmet from the future. After being neglected for years underneath the dryer after crashing in the asteroid field, he time-travelled back with the intention of causing the Armamageddon as revenge. Rex knocks Emmet under the same dryer to ensure his existence, but Lucy rallies the others into escaping from the storage bin (bringing them back into the LEGO world), and rescues Emmet from Rex. Emmet and Lucy overpower Rex and destroy his time machine. Rex turns redemptive but declares “no regrets” as he and his timeline are erased from existence.

Wa'Nabi and Batman finally wed, represented by Finn and Bianca reconciling with each other and agreeing to play together again. Their mother returns their LEGO toys, averting Armamageddon. The LEGO universe is transformed into a mishmash of Bricksburg and the Systar System called "Sysbrickstar" which is peaceful. Emmet's dream house is rebuilt and Lucy reveals that she was one of the original artists of "Everything is Awesome" much to Emmet's shock.