SMALLVILLE's co-creator Alfred Gough says the writers and producers were refused permission to feature Batman and Wonder Woman in the hit TV series.
The show centres on the early years of Clark Kent, before he donned the Superman costume, with Tom Welling in the lead role.
Gough, who left the series last year, spoke to Smallville magazine about his time on the show and said the key to its success was "the enduring power of Superman."
Asked which characters had been ruled off-limits, Gough said: "Just Batman and Wonder Woman. Those were really it. We used every character from a former Superman series or movie we wanted to."
He told the magazine: "We earned the right to incorporate a lot more of the DC mythology, which really lit a fire under the show. We introduced the future Justice League, Brainiac, Bizarro, the Fortress and Lois Lane. Suddenly we earned the right to use these toys from the DC toy box to great effect."
The show has also featured comicbook characters Aquaman, Martian Manhunter, Black Canary, Green Arrow, Cyborg and a junior version of The Flash. Guest appearances were made by actors from former Superman movies and series, including Dean Cain, Marc McLure, Helen Slater, Christopher Reeve, Terence Stamp and Margot Kidder.
The Show Also brought in 3 Legion of Super-Heros, feat. Lightning Lad, Cosmic Boy and Saturn Girl.
Hopefully the show will introduce more Characters from the Legion in the upcoming Season 9, which will air in the fall of 09'.
Well People I guess this is as good as it gets, with these Justice League Characters and Legion Characters. No Bruce Wayne coming into town on business, and no Wonder Woman Saving the day...