(S04E13) The latest season of Doctor Who gets resolved with a story that seems rushed, confusing and filled with self-love on the part of showrunner Russell T. Davies. But that doesn't necessarily mean it was bad.

To begin, the CGI and special effects are quite possibly the best ever seen on the show. Despite being in charge of the specials that will be airing next year, it seems that this episode was treated as the last that Davies will ever run. As a result, he wrapped up most every storyline he could think of going back to the first season.

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(S01E08) If your mother has told you once, she's told you a thousand times:  Don't mess with the time stream! Apparently, Rose (Billie Piper) never listened to her mum, or watched an episode of Star Trek (original or Next Generation) or any film in the Back to the Future series. Because, if she did, she would have realized that messing with the timeline can cause some serious consequences. In this case, by saving her father from a premature death, she opened the planet up to alien beings who cleanse Earth of all corrupted objects; i.e. humans.

See? Always listen to your mother!