"Mystery Files" is a pretty good show. However, one serious problem many of the episodes have is the brevity of the show. With only a half hour time slot, too often MAJOR historical figures are given only a cursory examination. This is definitely the case with Alexander the Great. A further problem is that historically, while a very important man, the records on the guy aren't as reliable or extensive as more recent world leaders.
This episode of "Mystery Files" is intriguing but silly. It is filled with more guesses and supposition than usual! Much of this is because no one really knows what happened with the body of Alexander! So, the theory that Alexander is really buried in the tomb of St. Mark's is pretty far-fetched AND impossible to prove. Interesting but an exercise in futility. So how does the show deal with their inability to prove anything or put forth a reasonable argument? They say 'But as in all scientific inquiry, no suggestions can be ruled out without conclusive proof'! In other words, without proof ANY crazy theory is acceptable-- or at least that's how I would interpret this. Probably not worth your time in light of the show really proving nothing.