Suggestions by @dc_black_label

Sam Neill

as Batman (flashback) in Wonder Woman: Dead Earth

Score: +1

Daniel Cudmore

as Superman (robot voice/flashback) in Wonder Woman: Dead Earth

Score: +1

Lauren Cohan

as Martha Wayne (flashback) in Batman: Three Jokers

Score: +1

Jeffrey Dean Morgan

as Thomas Wayne (flashback) in Batman: Three Jokers

Score: +1

Jack McGraw

as Bruce Wayne (flashback) in Batman: Three Jokers

Score: +1

Wes Bentley

as Doctor Phosphorus in Batman: Three Jokers

Score: +1

Russo Brothers

as Director in Batman: Three Jokers

Score: +1

Ramin Djawadi

as Composer in Batman: Three Jokers

Score: +1

Jason Bateman

as Joe Chill (flashback) in Batman: Three Jokers

Score: +1

Michael Douglas

as Joe Chill in Batman: Three Jokers

Score: +1

Kevin Michael Richardson

as Reverend Evans in Batman: Three Jokers

Score: +1

Robbie Coltrane

as Rupert Thorne in Batman: Three Jokers

Score: +1

Warwick Davis

as Gaggy in Batman: Three Jokers

Score: +1

Andre Braugher

as Swamp Thing in Batman: Damned

Score: +1

Elisabeth Moss

as The Joker's wife in Batman: Three Jokers

Score: +1

Elisabeth Moss

as "Honey" in Batman: Three Jokers

Score: +1

Jacob Tremblay

as "Junior" in Batman: Three Jokers

Score: +1

Jacob Tremblay

as The Joker's son in Batman: Three Jokers

Score: +1

Karl Urban

as Thomas Wayne (painting) in Batman: Curse of the White Knight

Score: +1

Karl Urban

as Thomas Wayne in Batman: White Knight

Score: +1