<P> The producers wanted to use either Wally West or Barry Allen as the Flash alter ego for the show, but DC Comics would only approve the use of Bart Allen . In DC Comics, Bart typically goes by the codename of "Impulse", but did have a short series in 2006 where he took over the role of Flash . Kyle Gallner learned through his agent about a superhero role being called for on Smallville, and when he learned that it was going to be Impulse, he convinced himself that he was going to win the role . Gallner went in for two auditions, but was so disappointed with his performance during the second audition that he believed he had failed to get the role . His fear was unfounded when the producers offered him the part . </P> <P> After being cast as Arthur Curry, a character who had previously never been officially portrayed in any live - action form, Alan Ritchson did some research on his character when he discovered that Aquaman had a "serious...fan base". Ritchson wanted to live up to the expectations he felt fans of the character would have . Like Gallner, Ritchson did not expect to be a part of the show again . After season five, there was an attempt to launch an Aquaman television series, which ultimately was never picked up . Ritchson relished the opportunity to return when he was called in to appear in the episode that would feature the first official appearance of the Justice League . </P> <P> Until season five's "Cyborg", the DC Comics superheroes who had paid Clark a visit on the show were all members of the Justice League of America, but Gough and Miller felt that Victor Stone shared a "relatable dilemma" with Clark--the fact that both Victor and Clark's abilities get in the way of their romantic relationships with the women they love--and was someone the developers felt was just an interesting character . Victor normally goes by the alias "Cyborg" and is a member of the Teen Titans in the comics . Casting Lee Thompson Young was something the producers had always wanted to do, even before they had decided to bring in Cyborg . The actor revealed that his first contact with the Cyborg character came not from the comics, but from the Teen Titans animated television series . According to Young, he was fortunate that this version of Victor Stone was Smallville's spin on the character, and as such, the majority of the character's background was in the script . While preparing, Young expressed his pleasure in the fact that the producers decided to keep Victor's robotic parts internal, as opposed to the comic version, where half of Cyborg's visible body is covered in metal . </P> <P> According to Gough, Justin Hartley was the producers' first choice to play the role of Oliver Queen, and his alter ego Green Arrow . Oliver was designed to provide an alternative view for what it means to be a hero . At the same time, the producers wanted a character that could impact the lives of both Clark and Lois . The actor is also the first to portray Oliver Queen / Green Arrow in any live - action media . Hartley believed that it was the season six episode "Reunion" that really helped him to understand his character . In the episode, it is revealed that Oliver was "a jerk to Lex" when the two were at school together, and after another kid falls into a coma because of Oliver and Lex's actions, Oliver decides to start a new path for himself . According to Hartley, this allowed the actor to "justify why someone would put their life in danger every night and have such strong feelings about going out and being this social advocate". Hartley was a recurring guest in the sixth and seventh seasons, but became a series regular in season eight . </P>

What episode of smallville does clark meet flash