Mars and EXO-6 should team-up to get as many shared 66 Batman/Trek cast member to us as possible
.
( not complete^, eg; Elisha Cook Jr (Starbase Lawyer), Shauna, Nona, Yeoman Mears, and other lovely would be molls, several Red Shirts/ henchmen, window cameos like Ted Cassidy, etc. and others I missed.)
+
Including Batman 66 crossover William Shatner as a retroactive live action Harvey Dent Two-Face! Borrowing a face sculpt from his sensational over-the-top Enemy Within performance, and costume from Piece of the Action
Which was absolute brilliant animated casting, 50 years after the fact ...
Also with all these shared actor going between 66 Batman and Trek; Montalbán should have played the Batman66's version of Ra's al Ghul
(though he didn't actually debut in comics till the 70s
)