Question: Who played the DC Comics fictional superhero, who first appeared in "Showcase" #4 and was created by Robert Kanigher, in the 1990 television series?

Context articles: List of Teen Titans Go! episodes
The Flash (1990 TV series)
Circe (comics)
Bouncer (Fox Feature Syndicate)
G.I. Robot
Metal Men
King Faraday
Flash (Barry Allen)
Black Canary
Robert Kanigher

"Teen Titans Go!
" is an American animated television series based on the DC Comics fictional superhero team, the "Teen Titans".
 The series was announced following the popularity of DC Nation's New Teen Titans shorts, both of which are based on the 2003 "Teen Titans" TV series.
 "Teen Titans Go!"
 is a more comedic take on the DC Comics franchise, dealing with situations that happen every day.
 Sporting a new animation style, "Teen Titans Go!"
 serves as a comedic spin-off with no continuity to the previous series, and only certain elements are retained.
 Many DC characters make cameo appearances and are referenced in the background.
 The original principal voice cast returns to reprise their respective roles.
The Flash is a 1990 American television series developed by the writing team of Danny Bilson and Paul De Meo that aired on CBS.
 It is based on the DC Comics character Barry Allen / Flash, a costumed superhero crime-fighter with the power to move at superhuman speeds.
 "The Flash" starred John Wesley Shipp as Allen, along with Amanda Pays, Alex Désert, and Paula Marshall.
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.
The Bouncer is a fictional character who appeared in comic books published by Fox Feature Syndicate.
 A superhero created by writer Robert Kanigher and artist Louis Ferstadt, he first appeared in "The Bouncer" (no number, September 1944).
 His final appearance was in "The Bouncer #14" (January 1945).
 He is the first comic book character created by Kanigher.
G.I. Robot is the name of a series of six fictional robots that appeared in comic books published by DC Comics.
 The very first G.I. Robot, nicknamed Joe, first appeared in "Star Spangled War Stories" #101 (February–March 1962), created by Robert Kanigher and Ross Andru, with a second one named Mac in "Star Spangled War Stories" #125 (February–March 1966), by Kanigher and Joe Kubert.
The Metal Men are a group of superheroes that appear in DC Comics.
 The characters first appeared in "Showcase" #37 and were created by writer Robert Kanigher and penciller Ross Andru.
 Debuting in the Silver Age of Comic Books, the characters have appeared in comic books and other "DC Comics"-related products such as animated television series, clothing, figurines and trading cards.
King Faraday is a fictional secret agent featured in DC Comics.
 Faraday first appeared in "Danger Trail" (1st series) #1 (July 1950), and was created by Robert Kanigher and Carmine Infantino.
The Flash (Barry Allen) is a fictional superhero appearing in American comic books published by DC Comics.
 Barry Allen is the second character to be known as the Flash.
 The character first appeared in "Showcase" #4 (October 1956), created by writer Robert Kanigher and penciler Carmine Infantino.
 His name combines talk show hosts Barry Gray and Steve Allen.
 Barry Allen is a reinvention of a previous character called the Flash that had appeared in 1940s comic books as the character Jay Garrick.
Black Canary is a fictional superheroine in comic books published by DC Comics.
 Created by the writer-artist team of Robert Kanigher and Carmine Infantino, the character debuted in "Flash Comics" #86 (August 1947).
 One of DC's earliest super-heroines, Black Canary has appeared in many of the company's flagship team-up titles including Justice Society of America and Justice League of America.
 Since the late 1960s, the character has been paired with archer superhero the Green Arrow professionally and romantically.
Robert Kanigher (June 18, 1915 – May 7, 2002) was an American comic book writer and editor whose career spanned five decades.
 He was involved with the Wonder Woman franchise for over twenty years, taking over the scripting from creator William Moulton Marston.
 In addition, Kanigher spent many years in charge of DC Comics' war titles, as well as creating the character Sgt. Rock.
 Kanigher scripted what is considered the first Silver Age comic book story, "Mystery of the Human Thunderbolt!"
 which introduced the Barry Allen version of the Flash in "Showcase" #4 (Oct. 1956).