There was an earlier version of this pilot which was made in 2003, featuring a different actor playing Walter.
There was another pilot that aired before this one.
For some reason, this episode is unavailable to stream on online services such as ITunes and Paramount+. It is available however on the out of print "Suddenly Brothers" and "Best of Seasons 1&2" DVDs. However it was omitted on the re-release version of "Best of Seasons 1&2".