Untitled Lego Movie Universe sequels

Warner Bros. originally had more movies planned for The Lego Movie universe. Aside from The Billion Brick Race, none of the sequels were given a name.

Plot
The premise of the sequels are unknown.

Why They Were Cancelled

 * 1) The Lego Ninjago Movie and The Lego Movie 2: The Second Part, despite receiving positive reviews (with the exception of the former, which received mixed reviews), underperformed at the box office compared to their predecessors.
 * 2) Warner Bros. ended their movie deal with Lego after half a decade of releasing four films.

Results

 * After Warner Bros. parted ways with The Lego Group from making theatrical films with them (though they are still working together with making video games and some direct-to-video productions), Universal Pictures acquired the theatrical film rights to Lego and will be making a different Lego Movie universe in which, would be unconnected to the Warner Bros. one.
 * Both The Billion Brick Race and The Lego Batman Movie 2 were permanently cancelled as a result of Warner Bros. giving up the film rights for Lego.
 * Unikitty ended after its third season in August 27, 2020, with a two-part series finale "The Birthday to End All Birthdays", thus concluding the Warner Bros. era of The Lego Movie franchise.