Suggestions by @smhc2005

John Astin

as Cluemaster in Batman '66: The Extended Universe

Score: +1

Rudy Vallee

as Lord Marmaduke Ffogg in Batman '66: The Extended Universe

Score: +1

Zsa Zsa Gabor

as Minerva in Batman '66: The Extended Universe

Score: +1

Barbara Rush

as Nora Clavicle in Batman '66: The Extended Universe

Score: +1

Anne Baxter

as Olga, Queen of the Cossacks in Batman '66: The Extended Universe

Score: +1

Ethel Merman

as Lola Lasagne in Batman '66: The Extended Universe

Score: +1

Joan Collins

as The Siren in Batman '66: The Extended Universe

Score: +1

Milton Berle

as Louie the Lilac in Batman '66: The Extended Universe

Score: +1

Hermione Baddeley

as Frontier Fanny in Batman '66: The Extended Universe

Score: +1

Tallulah Bankhead

as The Black Widow in Batman '66: The Extended Universe

Score: +1

Maurice Evans

as The Puzzler in Batman '66: The Extended Universe

Score: +1

Michael Rennie

as The Sandman in Batman '66: The Extended Universe

Score: +1

Dina Merrill

as Calamity Jan in Batman '66: The Extended Universe

Score: +1

Estelle Winwood

as Aunt Hilda in Batman '66: The Extended Universe

Score: +1

Cliff Robertson

as Shame in Batman '66: The Extended Universe

Score: +1

Carolyn Jones

as Marsha, Queen of Diamonds in Batman '66: The Extended Universe

Score: +1

Liberace

as Chandell in Batman '66: The Extended Universe

Score: +2

Walter Slezak

as The Clock King in Batman '66: The Extended Universe

Score: +1

Vincent Price

as Egghead in Batman '66: The Extended Universe

Score: +1

Shelley Winters

as Ma Parker in Batman '66: The Extended Universe

Score: +1