Duncan Allenmeyer was Lex Luthor's only friend at Excelsior Academy.
He was the main antagonist in the Sixth Season episode "Reunion" of the WB TV series Smallville.
As a teenager he was portrayed by Bryce Hodgson and his adult form was portrayed by Damon Schwabach-Morris.
Duncan was regularly bullied by his peers at Excelsior, due both to getting into the school on a scholarship and also his friendship with Lex Luthor. He accepted Lex for who he was as they both shared interests in the comic book Warrior Angel. Oliver Queen constantly tormented the pair and ripped Duncan's comic book in half.
Duncan and Lex discussed their futures and the two plan to do benevolent work for the poor together and promise to be partners. Just then he and Lex discovered Oliver and his friends stealing the answer sheet to their midterms from the principal's office.
Duncan wanted to use this incident to get Queen and his atrocious friends expelled, but Lex wanted to use this knowledge to blackmail Queen into making them more popular.
When Duncan refused to go along with it, the two got into a fight, which ended with Duncan stumbling into the street and being hit by a car while he was yelling at Lex and Oliver's friends. The accident had caused significant brain-damage and left Duncan as a vegetable.
It was reported that he had passed away due to his injuries when in reality Lionel Luthor had hired the best medical professionals available to try and reverse Duncan's condition.
Ten years later, after countless failed treatments, Duncan's doctors tried a new medication made using refined meteor rocks. The medication didn't quite bring Duncan out of his vegetative state, but granted him the power of astral projection, allowing him to leave his body and attack his former tormentors.
At the Excelsior 1996 class reunion, Duncan's astral body broke off the sword from the school statue and impaled Alden with it. That night, Oliver and Geoffrey talked about how they regret falling out of touch with Alden before he died.
When Geoffrey was leaving in his limo, an unseen force cut his limousine's fuel line and lighting the gasoline with a discarded cigarette causing the car to explode killing him in the process.
Upon his third treatment, he shattered a window to attack Lex and Oliver in Oliver's penthouse. He stood up to see one of his arrows flying towards him. It hits him in the shoulder and pins him to the wall. Just as one of his electrical arrows flies towards him, Clark speeds in front of it.
The resulting energy surge apparently disrupted Duncan's astral "ghost", causing him to completely flat-line. The pulse travels, Duncan's brain waves short out, and he goes limp. When Clark goes back to the clinic, Duncan has died and Lois has decided not to write her story.