Sex Medusa (2001)

While conducting a top-secret biological study in an underground sewage system, a team of scientists discovers a nest of alien eggs. Quickly destroying the eggs before they can hatch, the scientists are unaware that one of the eggs has already hatched, and an adaptable reptilian creature soon adapts the form of a beautiful woman who begins to integrate itself into human society. She is searching for sustenance and a means to fertilize her eggs, and an unknowing man subsequently falls for the human-looking creature to horrific results.

Cast
Carrie Ng Ka-Lai
Nomoto Miho 
Vincent Wan Yeung-Ming 
Elvis Tsui Kam-Kong 
William Leung Chi-Ming Leung Wing-Yim Kai Cheung-Lung 
Hui Pik-Kei Chan Tsung
David Lai Wai-Ming