From 1978: A really nice compilation of ABC on-screen promotions, and channel branding, for the September debut of, for me, the second-most iconic media property from the peak of the Star Age: the three-hour (with commercials) TV premiere of BATTLESTAR GALACTICA.
With hype like this, and sixty-five million Americans tuning in on opening night, it was inevitable that the only way would be down. A ratings slide that alarmed network execs just at the same time that (the far cheaper) MORK AND MINDY was surging. The die was already cast.
It's interesting to see that the opener is obliquely referenced by its 'saga of a star world' title (one of several working titles briefly considered for the series in 1977) even through the episode name doesn't appear anywhere on the programme itself.
There's also several shots (including a prominently featured Imperious Leader... kept in the shadows in the final cut and sidelined in the series proper) and some alternate effects work that don't appear anywhere in the completed episode.
Someone has also dubbed a reference to the "Android Sisters" (a production team gag) into the trail. Whether this was an outtake from the show itself, or done especially for the promo to raise a laugh, is lost in the mists of time.
Surprisingly, unless I blinked, neither the Ovions nor Muffet make much of an appearance... suggesting that either that material wasn't available when the promos were compiled or that the network wanted to hold back a few surprises for opening night. Which would have been slightly odd as both elements were heavily merchandised, covered in contemporary print media AND a cut of the film had already been released in Canadian cinemas.