Detective Conan: Episode One - The Great Detective Turned Small · review
First things first, if you haven't watched till around episode 800, do not watch this. This special episode is not for someone who is completely new to the anime (contrary to the title). This is for those who have watched this show in its entirety. And it will spoil a lot, if you were to watch this show. Anyways, here is the deal. To anyone who has been following the anime closely, this is practically a must watch. It hits you right in the feel. That nostalgia, those feels, the pleasure to see Ran and Shinichi goofing around, the time when Ran could smile wholeheartedly,the time when Shinichi was unaware of the threats posed by Black Organization, and then suddenly you realize that he has been carrying this burden for so many episodes that its impossible not to sympathize with him.
To go with the usual review process : Art is definitely solid, soundtrack the same (which is quite awesome), characters are Shinichi, Ran and many others, and story though remastered shows a lot of things which couldn't have been shown before.
And there are a lot of cameos, A LOT. It was interesting to see how the Black organization was working, and especially in light of recent developments. Nearly every character that has been introduced is probably shown in this 1.30 min special, and this is something that you should not miss.