Description:

NOT to be confused with the later novelizations that were based on the TV show...

This is the original novel which inspired the ABC tv series. The same author later wrote two novelization based on the tv series.

To add to the confusion, the publisher decided to use the same title and basically the same cover art for one of the novelizations.

This edition is the original novel, predating the television series, as originally conceived by the author, Murray Leinster.