Welcome to the Alt-verse, Season 1
Up to this point, Fringe had been doling out tidbits about an alternative universe that seemed to be conspiring against ours. But it wasn't until the end of the hour, as the camera pulled back from the building Olivia occupied to reveal that the Twin Towers were still standing, that we realized she had ''crossed over.'' How the hell did she do that?! Ken Tucker
''Fringe,'' ''Buffy,'' ''Dallas,'' ''The West Wing'' -- we pay homage to series that went into their breaks with a bang