Suggestions by @vincentwilliamsiii

Dr. Kirk Langstom (Man Bat)

as Dr. Kirk Langstrom in Batman I

Mister Freeze

as Victor Fries in Batman I

Mister Freeze and Nora

as Victor Fries in Batman I

Thomas Wayne

as Thomas Wayne in Batman I

Martha Wayne

as Martha Wayne in Batman I

Jimmy Olsen

as James Bartholomew “Jimmy” Olsen in Superman I

Lara Lor Van

as Lara Lor-Van in Superman I

Steel (John Henry Irons)

as John Henry Irons in Superman I

Lex Luthor

as Lex Luthor in Superman I

Lana Lang

as Lana Lang in Superman I

Metallo (John Corben)

as John Corben in Superman I

Lois Lane

as Lois Lane in Superman I

Superman

as Kal-El/Clark Kent in Superman I

Kal-El

as Kal-El/Clark Kent in Superman I

Jor-El

as Jor-El in Superman I

Perry White

as Perry White in Superman I

Saturn Girl

as Imra Ardeen-Ranzz in Superman I

Cosmic Boy

as Rokk Krinn in Superman I

Jonathan Kent

as Jonathan Kent in Superman I

Martha Kent

as Martha Kent in Superman I