|Cover of my original COSMOS book|
Of course, nothing can supplant the original, Carl Sagan was an amazing, intelligent, and eloquent person - a great ambassador for science. There are many videos on the net about/of Sagan: mashups with Sagan (think Symphony of Science), of Sagan speaking, and so on. I think I own and have read a good number of his books as well. I have a few favourite segments to share. In the original Cosmos, this opening segment is poetic and captures the viewer - at least this one - and the soundtrack was simply breathtaking.
My most favourite video/segment though is the Pale Blue Dot. This has become well known, especially since the renewal of Cosmos. Watch and be moved.