How To Bridge: Batman Across The DCAU

First Watch Batman: The Animated Series

Then watch the cult classic Mask Of The Phantasm

After that enjoy another DCAU Film, Batman: SubZero

Then cross over to Superman: The Animated Series and watch the the three part special World’s Finest  eps  AKA ‘The Batman Superman Movie” on released video

Then start on the The New Batman Adventures

After ending that watch Batman: Mystery of the Batwoman

Then watch Justice League the way into Justice League: Unlimited and skip ep “Epilogue”

Then watch Batman Beyond

Then for the final DCAU film on this list. Watch The Return of Joker

After that go back and watch The episode  “Epilogue”