This is a silly little story; I suspect Briefer just wanted to draw mummies. It does end with a nice visual punchline, though, unlike the first two stories in this issue. But seeing Frankenstein strolling the ship's deck in a suit, complete with straw hat and walking stick, is hilarious. Oh, and that establishing shot of Egypt is a hoot.
This is the third of four stories in this issue.
Here is "Frankenstein and the Mummies" from Frankenstein #3 (July-August 1946):