If you are in the United Kingdom, you can watch Doctor Who online with BBC-iPlayer.
Sometimes both new and old episodes are shown.
MSN Video show older versions of Doctor Who, but the quality isn't that good.
Youtube.
If one wanted to watch episodes of Call The Doctor online, they can visit websites like WVIA. They can go to the On-Demand portion of the website and watch as many episodes of Call The Doctor as they could desire.
Netflix is a good place, at netflix.com
The best place to find an online doctor is Medicalium at https://medicalium.co.uk/
If you search online for [Doctor Who subtitles], you'll see that many of the episodes, and especially the newer episodes, have subtitles available in about 20-25 languages.
You can find them on Netflix and online.
A person can find the last few episodes of David Tennant as Doctor Who through video streaming services such as Hulu Plus. A person may also watch these episodes through their digital cable service.
you can go to wikipedia for the all the episodes and their descriptions. or you can go on you tube and watch videos for the episodes.
A&E TV has the first 48 episodes online for viewing. You can also find episodes of friends available on Slide Share. There are several site beyond these that provide episodes of Friends.
Finding full episodes of Blues Clues in UK is easy. You can find the episodes online all you have to do is download them.
There are 13 episodes in every season of Doctor Who.