To be perfectly honest, nothing that extraordinary happens during this story. Ludwig Frankenstein (of that Frankenstein family) tricks the Silver Surfer into powering his monster. The rest of the story is the Surfer trying to stop this aberration.
There is also a subplot with Ludwig’s long suffering assistant Borgo, who has enough of his master. The two meet their demise as they fall out of a castle window.
Silver Surfer #7 really doesn’t offer that much. It’s recommended only for the completist.