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Truth is, it was three different men playing two different numbers.
I think they look alike. As you say, Colin plays nerdy Alex on the WB teen drama Roswell and also can be seen on the big screen in Whatever It Takes . His series, though worthy, is struggling in the ratings and his less-worthy movie was a disappointment at the box office, but I'd say his career shows promise. Hey, his dad started out in a dress and just look at him now. The answer to your question is that we sort of know, though I'm sure it won't be to the satisfaction of die-hard Harley aficionados, so let me say up front that I know this answer is a little vague.