I'm going to be critical here, but only because I want this series to be good. There were a lot of wonderful things about this, like the voices, the 3d rendering, the after effects, music... I could go on telling you what you are already aware looks/sounds good, and I won't. One of the first noticeable elements that I felt let this down was the depth in the characters when compares to their surroundings. This does improve during the video as your using shading and lighting to make them appear not so flat, but that's lacking at the beginning. Perhaps you were making this trailer and improving as you went, and that's great. But I feel you should at least go back and deepen the opening details to the quality of the last 20 seconds of the teaser. Another Item that you may want to address reletive to this is the colour set. You have dark scenes with a very bright pallette for your illustrated subjects (like the playing card at the beginning was the first thing to catch my eye). If you get what I mean, certain things stands out for the wrong reasons.
Where the voices are fantastic quality, the lip sync lets your cast down. You relly need to reassess all the vowles, tongue, tooth and jaw movements you need for convincing speech. It's not like the lip movements you have done are wrong, there just arn't enough variations of movements compares to what your characters are saying to us. I know what others that may have read my previous reviews may say... 'But loads of people have limited mouth movements and you don't say anything about them'. ...That'll be because a lot of similar things I've reviewed/commented on doesn't have the potetial this does, and I want to do my public duty to help make it right.
This may be a sensitive topic now, and it really is my Opinion alone here, but I was in two minds about watching this video all together, because of the title. I know, 'Don't judge a book by it's cover', and its true I shouldn't had, because this was good! But my thoughts only, but 'Super Hero Clock' is a really lousy title. I think you might lose a lot of potential viewers because of it.
So... Depth, Lips, Title. Those are my areas of negative nancies for this. Open those files up, tweak them and re-release this Teaser. I can bet you will have even more positive feedback. Loking foward to the first episode. Don't let the tiny details let you down! ^_^