Sorcerers' World, also known as Zerox is a fictional planet, a comic book location appearing in titles published by DC Comics.
 Sorcerers' World first appeared as Zerox, the Sorcerers' Planet, in "Action Comics" vol.
 1 #301 (June 1963), and was created by Leo Dorfman and Jim Mooney.
 It was reintroduced as Zerox, the Sorcerers' World, in "Adventure Comics" vol.
 1 #369 (June 1968), by Jim Shooter and Curt Swan.
Justice League of Earth are fictional characters, a supervillain team of the 31st Century in the DC Comics universe.
 They were created by Geoff Johns and Gary Frank and first appeared in "Action Comics" #859 (January, 2008) as enemies of the Legion of Super-Heroes.
Action Comics is an American comic book series that introduced Superman, one of the first major superhero characters as the term is popularly defined.
 The publisher was originally known as National Allied Publications, and later as National Comics Publications and as National Periodical Publications, before taking on its current name of DC Comics.
 Its original incarnation ran from 1938 to 2011 and stands as one of the longest-running comic books with consecutively numbered issues.
 A second volume of "Action Comics" with issue #1 ran from 2011 to 2016.
 "Action Comics" returned to its original numbering beginning with issue #957 (Aug. 2016).
The Legion of Super-Pets is a fictional team of super-powered pets in the pre-Crisis DC Universe.
 Members include Krypto the Super-Dog and Streaky the Supercat.
 The team first appeared in "Adventure Comics" #293 (February 1962), though most of the members had appeared in earlier issues.
Streaky the Supercat is a fictional character that appears in comic books published by DC Comics.
 Streaky first appeared in "Action Comics" #261 (February 1960) and was created by Jerry Siegel and Jim Mooney.
Circe is a fictional character appearing in DC Comics publications and related media.
 Based upon the Greek mythological figure of the same name who imprisoned Odysseus in Homer's "Odyssey", she is a wicked sorceress and a major adversary of Wonder Woman.
 Circe first appeared as a ravishing blonde in 1949 in "Wonder Woman", vol.
 1, issue #37, written by Robert Kanigher and illustrated by Harry G. Peter.
 She would make a Silver Age return, going from blonde to raven-haired, to battle Rip Hunter in "Showcase" #21 in 1959 (written by Jack Miller and illustrated by Mike Sekowsky), followed by multiple appearances as a foil and sometimes-ally for Superman and Supergirl in "Action Comics" and "Superman's Girl Friend, Lois Lane".
 In 1962 her "creator" Robert Kanigher pitted her against the Sea Devils in "Sea Devils" #3, illustrated by Russ Heath.
 She would get a Bronze Age makeover (this time with auburn hair) in 1983's "Wonder Woman" #302, by Dan Mishkin and Gene Colan, making multiple appearances over the next two years.
 Circe would be re-imagined in June 1988, by comics writer/artist George Pérez as part of his reboot of the Wonder Woman mythos.
 This version, with red-eyes and violet hair, would become one of Wonder Woman's principal post-Crisis foes.
 Circe was re-introduced yet again in 2011 in "Men of War" (vol.
 2) #2, as part of the DC Comics continuity-reboot known as The New 52.
 This version of the character, with blood-red hair and pale white skin, was written by Ivan Brandon and illustrated by Tom Derenick.
Atlantis is depicted as a real location in the fictional DC Comics Universe.
 The very first DC Universe version of Atlantis debuted in "Action Comics" #18 (November 1939), and was created by Gardner F. Fox and Fred Guardineer.
 Other versions appeared in various DC comics in the 1940s and 1950s, including the version in the Superman group of books in which the mermaid Lori Lemaris resides.
 Aquaman's version of the city, the most prominently featured version in the company's line, first appeared in "Adventure Comics" #260 (May 1959), and was created by Robert Bernstein and Ramona Fradon.
 All versions are based on the mythical island of Atlantis first mentioned in Plato's initial dialogue, the "Timaeus", written c. 360 BC.
Rainbow Girl (Dori Aandraison of the planet Xolnar) is a fictional character and a DC Comics super heroine.
 She first appeared in "Adventure Comics" #309 (June 1963) as a rejected Legion of Super-Heroes applicant.
 Her second appearance was 25 years later in "Who's Who in the Legion of Super-Heroes" #5 as a socialite.
 She did not appear again for nearly 20 years until "Action Comics" #862 as a member of the Legion of Substitute Heroes, an organization of teenage heroes that exists one thousand years in a future universe.
Bill the Cat, or Bill D. Cat, is a fictional cat appearing in the works of cartoonist Berkeley Breathed, beginning with the comic strip "Bloom County" in the 1980s and continuing in "Outland" and "Opus" in the following decades.
 Bill also appeared in some of Breathed's illustrated children's books, including "A Wish for Wings That Work", which was also made into an animated Christmas television special, and also on greeting cards and other sundry merchandise.
 The cat's most frequent spoken sentiments are "Ack!"
 and "Thppt!"
, unlike most other animals (and children) in Breathed's work, who not only can speak English, but have advanced vocabularies.
 The former is a result of his regularly choking on hairballs, the latter sound an approximation of the "raspberry".
Hector the Cat (also known as Hector Cat, Hector the Road Safety Cat or simply Hector) is a fictional cat and mascot created to aid the teaching of road safety to children in Australia.
 Educational material relating to the character was developed by the Australian Department of Transport in association with state and territory road authorities.
 "Hector's road safety song" became well known in Australia when it was shown as a public service announcement on television.
 The blue and yellow striped cat first appeared on a school calendar in 1971 with a storyline that he had lost eight of his nine lives due to "ignorance of road safety practices".
 This was followed by a short instructional film.
 In subsequent years other characters were introduced in calendars, instructional films, and comic books including Millie, his girlfriend (1973), Uncle Tom (1974), Hector and Millie's three kittens (1975) and his space friend Ding Dong (1982).

Question: The fictional cat that first appeared in "Action Comics" #261 belongs to what team of pets?
Answer: The Legion of Super-Pets