Here you find the videos introducing you to Alice 3 with the Hour of Code curriculum. Alice 3 has been created by the Carnegie Mellon University. They have all rights on the below videos.
I am showing them here for easier access, on the Alice website they are only available as downloads.
Overview about the Activity
Developing your Story with a Storyboard
Refining your Story with a Script
The Scene Editor
The Code Editor
A Final Project