Untitled Batman sequel (1960s)

Note: Please, do not add "Adam West died in 2017.", because this was before he died. Following the release of Batman in 1966, a sequel was in development with Adam West and Burt Ward reprising their role as the Caped Crusaders.

Plot
The film would've been about Batman and Robin fighting criminals in outer space.

Why It Was Cancelled

 * 1) The Batman TV show was cancelled after 3 seasons.

Results

 * The film was permanently cancelled.
 * Adam West and Burt Ward would later reprise their role in two direct to video film, Batman: Return of the Cape Crusaders, and Batman vs Two Face￼.