Are all the plots of Mummy films the same? It seems like that to me. Even those Brendan Fraser ones has the mummy being some evil guy murdered for being a dick then being reanimated only to look for the reincarnation of his lover and enabler. This one, like that one, and Voodoo Black Exorcist, has that plot.
Paul Naschy is the jerk Pharoh who thought that murdering loads of women for a laugh was a long-term career move, so when his side-kick murders him and his missus he vows revenge, which he doesn't get as by the time his ancestor gets him resurrected the guy who killed him is long dead. Nevertheless, it's strange that the daughter of the guy who arranged to have him dug up looks a lot like that chick who was involved in all that blood drinking.
Yeah, the plot's boring and crappy but the execution of said plot is not, despite Jack Taylor being the bland hero. This is because Naschy knows what horror fans want, so the mummy cuts a swathe through London's cops and anyone else who gets in his way, including some security guard who gets his head crushed for his trouble.
It's business as usual to be honest, but if you like Paul Naschy films, you'll like this one. He doesn't put a foot wrong and even has a random bit of gore when the mummy goes around smashing his victim's heads like they are over ripe melons.