What studios produce dubbed TV shows?
I found this post, "What popular science fiction TV shows are available with Chinese dubbing?", which provides links to various services. I am not advocating these services as most of them are illegal, however it will provide you with good information and many examples of movies and series that have been dubbed.

Examples are verycd.com which now no longer provides links to illegally stream, but will provide you with info of different series that have been dubbed.

NORMTEAM, e.g. http://www.normteam.com/thread-33919-1-8.html

And PPTV.

These should provide you with plenty of examples. However you will need to dig a bit to find what you are looking for and I personally wouldn't attempt to view anything from these sites because the software is so damn dodgy.

The problem is there are literally thousands of shows that have been dubbed in Chinese. If I was after this information and it was just for personal use I would just go to my local Chinese video store and ask them what dubbed series that have on offer.