The only thing horrifying about this movie is that it got greenlighted, backed, and filmed: It's more horrendous than horrifying.
I have never given a zero rating before as I try to find good in everything, though no matter how hard I tried I couldn't do it with this travesty of a movie.
The story of The Blob's return is told in a series of skits and sketches, which are meant to be humorous and scary... Unfortunately, the writer Jack A Harris (who produced the film) and screenwriters Anthony Harris and Jack Woods evidently couldn't grasp either concept as the laughs are on the audience who paid good money to watch this, which is the only horrific idea related to the film. Not having read Richard Clair's story "A Chip Off The Old Blob!" (which is also a much better and funny title for a comedy horror movie) I cannot say if these traits stem from here.
Then they give the directors hat to Larry "JR Ewing" Hagman. Though he'd directed five TV episodes this was his first full-length movie and it shows. It could also be the reason he never went back to directing for the big screen.
Another shock was to see some big'ish names appearing in cameo roles... Robert Walker Jr, Carol Lynley, Shelley Berman, Cindy Williams, Burgess Meredith, Dick Van Patton, and even Sid Haig
All these names do not a good film make. Instead of watching this movie, go paint that bedroom you've been putting off and then grab a chair and watch that paint dry, you'll have a more entertaining and productive time.