For all the amazing, wonderful energy that Doctor Who puts out into the world, it's not a perfect show, something that even the most hardcore Whovian will probably admit.
Sometimes it's a bit too complicated, sometimes it's a bit too silly, and sometimes, the acting leaves a lot to be desired. But the king of all these flaws - the one weak point that stretches back to the very origins of the show - is its special effects.
From that ridiculous giant rat in The Talons of Weng-Chiang to the Wirrn from Ark in Space, Doctor Who has been struggling to depict its fantastical sci-fi worlds and crazy alien creatures for the past 57 years, and when the show started to heavily incorporate CGI in its 2005 revival, the BBC's purse-strings didn't suddenly get a lot looser.
So while there have been some fantastic special effects in this modern era of Doctor Who, there have definitely been more naff ones than good ones. In fact, you could probably choose any episode at random to find a couple of examples of rough CGI.
But rather than rambling on for hundreds of entries, let's be a bit more selective, shall we? Here are some of the worst offenders: the dodgiest CGI we've seen since Doctor Who returned to our screens in 2005.