However, to avoid comparison to the upcoming film "The Matrix", the imprint was renamed "Helix". The imprint continued until 1998, when its "signature book" "Transmetropolitan" transferred to the Vertigo imprint. Additional Helix titles were later republished in collected editions under the Vertigo brand. Impact Comics, also stylized !mpact Comics or Impact! Comics, was a superhero imprint for DC Comics using the Red Circle characters licensed from Archie Comics. The line was supposed to be a newsstand based line aimed at the younger readers within its own self-contained universe. "The Comet", by creators Mark Waid and Tom Lyle, was the imprint's longest running title. The imprint was also supposed to be a training ground for new talent. Impact was launched in July 1991 with several titles: "Black Hood", "The Fly", "Jaguar", "Comet", "Legend of The Shield" and "The Web". In May 1992, the imprint got its first team title, "The Crusaders", lasting eight issues. From October to December 1992, various titles were canceled. The miniseries "Crucible" began in February 1993 by writers Mark Waid and Brian Augustyn and artist Joe Quesada and was an attempt to relaunch the line, but with sales still lagging, the imprint was instead canceled. Johnny DC, later "DC Entertainment", was DC's imprint for its all ages cartoon titles. Previously, Johnny DC was used in the Silver Age as a mascot for DC Comics. DC started a Warner Bros cartoon characters line featuring Looney Tunes and Cartoon Network with the April 1994 issue of "Looney Tunes". In September 2004, DC upgraded this line to a full imprint as Johnny DC for the November cover date. In the same month, the imprint added "The Batman Strikes", a comic based on the Cartoon Network series "The Batman", and "Cartoon Network Block Party," an anthology title. In September 2006, a "Krypto the Superdog" comic was released based on the Cartoon Network series of the same name. Three new titles, "Billy Batson and the Magic of Shazam!", "Tiny Titans" and "Super Friends", were launched in August 2007 by Coordinating Editor Jann Jones. In February, "Tiny Titans" ' first issue was released, while in March the "Super Friends" title was relaunched, now based on the Mattel toyline of the same name. "Supergirl: Cosmic Adventures in the Eighth Grade" began in December 2008 as an ongoing series as a "push to put some energy into the line and actually attract the younger readers it's ostensibly aimed for."