Question: Which superhero created by Jerry Siegel and artist Joe Shuster was featured in virtually every issue of World's Finest Comics?

Context articles: Rose Psychic
World's Finest Comics
Superboy (Kal-El)
Lois Lane
Superman
Superman and Lois Lane
Tony Strobl
Doctor Occult
Superboy-Prime
Action Comics 1

Rose Psychic is a DC Comics heroine affiliated with the company's first superhero, Doctor Occult.
 They were created by Jerry Siegel and Joe Shuster, the creators of Superman.
 She first appeared in "More Fun Comics" #6 (October 1935).
 She appeared in Dr. Occult's first story, and then disappears from the story until 1938.
 After Dr. Occult's original stories ended in late 1938, Rose did not appear again for more than fifty years.
World's Finest Comics was an American comic book series published by DC Comics from 1941 to 1986.
 The series was initially titled "World's Best Comics" for its first issue; issue #2 (Summer 1941) switched to the more familiar name.
 Michael E. Uslan has speculated that this was because DC received a cease and desist letter from Better Publications, Inc., who had been publishing a comic book entitled "Best Comics" since November 1939.
 Virtually every issue featured DC's two leading superheroes, Superman and Batman, with the earliest issues also featuring Batman's sidekick, Robin.
Superboy is a fictional superhero that appears in American comic books published by DC Comics.
 The character was created by Jerry Siegel and Don Cameron and is based on the character of Superman that Siegel co-created with Joe Shuster.
 Superboy first appeared in the comic book "More Fun Comics #101" in 1945.
Lois Lane is a fictional character appearing in American comic books published by DC Comics.
 Created by writer Jerry Siegel and artist Joe Shuster, she first appeared in "Action Comics" #1 (June 1938).
 Lois is a reporter for the Metropolis newspaper, the "Daily Planet", an award-winning journalist and the primary love interest of the superhero Superman.
Superman is a fictional superhero appearing in American comic books published by DC Comics.
 The character was created by writer Jerry Siegel and artist Joe Shuster, high school students living in Cleveland, Ohio, in 1933.
 They sold Superman to Detective Comics, the future DC Comics, in 1938.
 Superman debuted in "Action Comics" #1 (cover-dated June 1938) and subsequently appeared in various radio serials, newspaper strips, television programs, films, and video games.
 With this success, Superman helped to create the superhero archetype and establish its primacy within the American comic book.
 The character is also referred to by such epithets as the Big Blue Boy Scout, the Man of Steel, the Man of Tomorrow, and the Last Son of Krypton.
Superman/Clark Kent and Lois Lane are among the best known fictional couples.
 Created by writer Jerry Siegel and artist Joe Shuster, both characters (including Superman's alter ego, Clark Kent) first appeared in DC Comics' "Action Comics" #1 (June 1938).
 They have remained in a complicated relationship ever since.
 The couple has been portrayed in multiple Superman adaptations in different media.
Anthony Joseph (Tony) Strobl (May 12, 1915 – December 29, 1991) was an American comics artist and animator.
 He was born in Cleveland, Ohio and attended Cleveland School of Art from 1933–37, with Jerry Siegel and Joe Shuster, who actually got some help from Strobl creating Superman.
 Gerard Jones in his book "Men of Tomorrow" reveals at one point Jerry Siegel contemplated ending his partnership with Joe Shuster in developing what became Superman and work with someone else instead.
 Strobl was among those approached but he respectfully declined, feeling his more cartoony artstyle was ill suited for such a serious character.
Doctor Richard Occult is a fictional superhero appearing in American comic books published by DC Comics.
 Created by Superman's creators Jerry Siegel and Joe Shuster, Doctor Occult, also known as the Ghost Detective, is a private investigator and user of magic who specializes in cases involving the supernatural.
 Doctor Occult is the earliest character created by DC Comics still currently used in the DC Universe.
Superboy-Prime, (Clark Kent, born Kal-El) also known as Superman-Prime or simply Prime, is a DC Comics superhero turned supervillain, and one of several alternate Supermen.
 The character first appeared in "DC Comics Presents" #87 (November 1985), and was created by Elliot S!
 Maggin and Curt Swan (based upon the original Superboy character by Jerry Siegel and Joe Shuster).
"Action Comics" #1 (June 1938) is the first issue of the original run of the comic book series "Action Comics".
 It features the first appearance of several comic book heroes—most notably the Jerry Siegel and Joe Shuster creation, Superman.
 For this reason it is widely considered both the beginning of the superhero genre and the most valuable comic book of all time.