9. The Adam Knight Mystery
Despite the young Bruce Wayne series being scrapped in favour of Smallville, that didn't stop rumblings and speculation that Smallville's producers at one time had plans to make Bruce a part of the show.
In fact, when Ian Somerhalder was cast in Smallville, he was under the impression that he would be playing Bruce Wayne. An orphan who had travelled the globe and was an expert in many martial arts, Somerhalder instead played a character called Adam Knight - a character who was ultimately a Lionel Luthor-resurrected sort with a dependency on a Lazarus serum.
Smallville producers have often played down that Adam Knight was intended to be Bruce Wayne, but Somerhalder himself has publicly stated numerous times how the arc for his character was changed at the last minute. In fact, the actor has even claimed how he'd actually shot three episodes of Smallville thinking he was a different character, before it became clear that Adam Knight was different to what had initially been promised to Somerhalder.
Was Ian Somerhalder promised that he would be playing the Dark Knight in waiting? Was it merely implied that Adam Knight might actually be Master Bruce? Was Adam Knight's story always planned to play out how it did?
Only a select few people know the complete truth on this matter, but the end result was a largely disappointing one for audiences as Knight went from mysterious, intriguing character, to just another run-of-the-mill villain.