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 to make theatrical films with them (as they are now working together to make 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.
 * The Warner Bros. Lego Movie franchise concluded with the Unikitty two-part series finale "The Birthday to End All Birthdays".