There have been many science fiction shows on air,
some were successful, some never made it past the first season.
However, few have any spawned a successful series of media tie-ins.
Babylon 5 created something new: these media tie-ins would actually
be used to enhance the story arc of the series. After a rather bumpy
start, it seems that jms has succeded. You can also order the music
in the series, which is the richest any series ever had.