One of my favorite kids TV shows is "Word World" on PBS. I love movies and shows that teach kids something and this is definitely one that does.
The word animals, Sheep, Duck, Dog, Ant, Pig etc. run into some kind of problem as they go about their days in word world. They find and sound out letters and end up solving their problem by "building a word".
It's cute and fun and my kids love it.
Another great Preschool kids show is "Super Why", also on PBS.
In each episode one of the "super readers" has some problem that they don't know how to solve. All the super readers get together and solve their problem by "looking in a book." They pull out a book, jump into it, read it and see what they can learn from it and how they can apply it to helping them solve their problem.
Another cute show my kids enjoy.
There are many other fun preschool shows out there like Curious George, Clifford, Dinosaur Train, etc. You can find them at pbskids.org. There are also fun games and activities for kids to do on that site.