It may have been a little hasty of Murgatroyd's PR people (AKA the Franco American Novelty Company) to say that he was a bigger phenomenon than the King Tut Magic Mummy. There wasn't anything bigger than this in the novelty line in the late 1940s! King Tut had Mystery Action, for one thing, which is more than motionless Murgatroyd had. Plus he came in bright colors like Blue Raspberry Popsicle blue or Chemical Green Apple green. And his sarcophagus has that snappy red lining.
And please note the WARNING on the ad (from Billboard, December 18, 1948):
The manufacturer of the original KING TUT MUMMY is going to prosecute to the full extent of the law all imitators and infringers of this item. Be on the safe side buy the original in the blue and orange box called KING TUT, THE MAGIC MUMMY.
Or else! Or else you may find a few hundred of these things flying through the air to give you a smack on the head!
Well, but what does King Tut do? Oh, he comes to life with Mystery Action, that's all! You have to help, though. Just keep him in the plastic sarcophagus and then hand him over to someone else. He will fly right out of there, pronto.
This is sort of like being half asleep on Monday morning and then realizing that there is coffee nearby. So you jump up, of course! Without flying through the air. Mostly. I wish I knew King Tut's secret. My theory is that it involves caffeine in some way.
Actually, I can tell you the secret because I found the patent, here. It has to do with magnets, one in a false bottom of the sarcophagus (if you want more details by all means please click on over to the patent and enjoy). If you want the mummy to stay put you tilt the sarcophagus so that the correct magnets line up. Hand it over to an unsuspecting friend, who will hold it lying flat - and King Tut jumps up like a Starbucks barista just called out that his Gingerbread Latte is ready for pick up.
You can see a picture and description of a green King Tut Magic Mummy here at Time Passages Nostalgia. The picture of the blue one is from Byemylife. Thanks to them, and to Rob's Puzzle Page, too, which cited the 1949 patent for this toy. They still make these today, by the way. And the gingerbread latte is from here, of course.