I loved the show when it first came out, never missed an episode--but I have no idea what happened after Season 3 (is that when it left Fox?)

Last year I bought Seasons 1-3 (the first 2 are in one package) but I've only watched the first few episodes--haven't even OPENED Season 3 yet. I'd like to own 'em all, but like Martin pointed out, the later seasons are outrageously expensive. (I was only able to get Season 3 during some weird promotion on Amazon..)

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