Captain Marvel [Billy Batson]; Dr. Sivana (villain); King Zurk (villain); Mr. Grunbock
Dr. Sivana traps Billy with paralyzing gas and leaves him in outer space, unable to change to Captain Marvel. But when he discovers the Azpaks have taken over the world and want to kill him, Sivana is forced to rescue Billy to help destroy the Azpaks.
Captain Marvel, Jr. [Freddy Freeman]; Robin Hood; Merry Men; King Richard the Lionhearted; John Freeman (first appearance, Freddy's ancestor, first to bear his family name); Earl of Nottingham (first appearance, villain)
Freddy is magically summoned into the past by his ancestor to help him rescue Robin Hood and his Merry Men from the Earl of Nottingham.