The one accusation that can't be levelled at Series X is a lack of ideas. With scenarios and stories floating around Doug's head for over a decade, there was never going to be a shortage of adventures for the crew to get up to. Indeed, many episodes seem to have almost too many ideas, with several interweaving plots competing for screen time. As such, there's a nagging feeling that we'd liked to have seen more of certain elements, as not all of the questions raised by the concepts were fully answered in the series.

This article, therefore, lists ten of the biggest talking points from the series - a series that contains enough invention and intrigue to keep us talking for years. We're not saying that these are plot holes or things that Doug neglected; these are just topics that it's fun and interesting to speculate on in a far more in-depth manner than the pace of a half-hour sit-com episode will allow. In several cases, it's good and proper that these things weren't expanded upon within the episodes; not only would it have taken up valuable screen time, but it would also have been a shame if we hadn't been able to ponder on any in-universe interestingness in the weeks, months and possibly years we'll spend waiting for Series XI.

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