Suggestions by @jasonadams1

Eli Wallach

as Mr. Freeze in Batman (1971)

Score: +1

David Wayne

as Mad Hatter in Batman (1971)

Score: +1

Clint Eastwood

as Two-Face in Batman (1971)

Score: +1

Frank Gorshin

as The Riddler in Batman (1971)

Score: +1

Adam West

as Batman in Batman (1971)

Score: +1

Yvonne Craig

as Batgirl in Batman (1971)

Score: +1

Burgess Meredith

as The Penguin in Batman (1971)

Score: +1

Burt Ward

as Robin in Batman (1971)

Score: +1

Andy Griffith

as Commissioner Murphy in Batman (1971)

Score: +1

Neil Hamilton

as Mayor James Gordon in Batman (1971)

Score: +3

Julie Newmar

as Catwoman in Batman (1971)

Score: +1

Cesar Romero

as The Joker in Batman (1971)

Score: +1

Dionne Warwick

as Iris West in The Flash (1971)

Score: +1

William Shatner

as Captain Cold in The Flash (1971)

Score: +1

Gene Wilder

as The Pied Piper in The Flash (1971)

Score: +1

James Caan

as Mirror Master in The Flash (1971)

Score: +1

Don Knotts

as The Trickster in The Flash (1971)

Score: +1

Adam West

as Batman in The Flash (1971)

Score: +1

Frank Gorshin

as The Riddler in The Flash (1971)

Score: +1

Robert Redford

as Green Lantern in The Flash (1971)

Score: +1