Batman The Animated Series. Voices of the Knight
Kudos to Mark Hamil. He clearly gets it. And he brought new life and a new take to the Joker character, even though I wish they focused more on his visuals and less on the slapstick wackiness which was traditionally the Riddlers role. Hamil nails it on the Jokers laugh in that it should be a symphony of psycho that changes with the theme and mood of the character.
NO CARTOON VOICES. That was the rule towards the voice actors of Batman The Animated Series. In keeping with the movie style of the series, the voice director, producers and writers found actors with character voices rather than voice actors with cartoon voices. This made the casting of Kevin Conroy, Efrem Zimbalist, Jr., Mark Hamill, and Adrienne Barbeau of their respected characters of Batman, Alfred, Joker, and Catwoman.
Here is the insight of the voice acting work on Batman The Animated Series.