Untitled Batman Beyond: Return of the Joker sequel

A second Batman Beyond film was planned, but it was cancelled due to the dark tones and controversies surrounding the previous film Batman Beyond: Return of the Joker.

Plot
The plot is currently unknown.

Why It Was Cancelled

 * 1) The film was cancelled following the controversies surrounding Batman Beyond: Return of the Joker (mentioned earlier).

Result

 * The film was permanently cancelled.