Nicole Jaffe. Nicole Jaffe was 61 in Scooby-Doo Meets Batman as 'Velma Dinkley (voice) (archive footage)'.
Casey Kasem. Casey Kasem was 70 in Scooby-Doo Meets Batman as 'Norville 'Shaggy' Rogers / Robin (voice) (archive footage)'.
Don Messick. Don Messick would have been no older than 71 in Scooby-Doo Meets Batman as 'Scooby-Doo / Professor Flakey (voice) (archive footage)'.
Heather North. Heather North was 51 in Scooby-Doo Meets Batman as 'Daphne Blake (voice) (archive footage)'.
Frank Welker. Frank Welker was 56 in Scooby-Doo Meets Batman as 'Fred Jones (voice) (archive footage)'.
Olan Soule. Olan Soule would have been no older than 84 in Scooby-Doo Meets Batman as 'Batman (voice) (archive footage)'.
Ted Knight. Ted Knight would have been no older than 62 in Scooby-Doo Meets Batman as 'The Penguin / Troll (voice) (archive footage)'.
William Hanna. William Hanna would have been no older than 90 in Scooby-Doo Meets Batman as 'Director, Producer'
Joseph Barbera. Joseph Barbera was 91 in Scooby-Doo Meets Batman as 'Director, Producer'
Joe Ruby. Joe Ruby was 69 in Scooby-Doo Meets Batman as 'Writer'Ken Spears. Ken Spears was 64 in Scooby-Doo Meets Batman as 'Writer'