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 Lego to make theatrical films with them, Universal Pictures acquired the rights to Lego and will be making a different Lego Movie universe not connected 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".