Three versions were at one time available on VHS:
The originally transmitted two-part (45 minutes each) version, which was later released onto VHS.
A movie version, tying both parts together (88 minutes approximately), which was released as part of the movie series.
An extended movie version, with all the deleted scenes incorporated (over 2 hours), which was released as a Collector's Edition along with a 50-minute documentary.
The latter version is now available on the Season Seven DVD, and the second version is now available on the TV Movie Series box set.