According to Sumerian mythology, there was a pantheon of gods and goddesses called the Annunaki. These gods arrived on our planet from Nibiru and created our species as work labor. These gods lived the equivalent of about 432.000 terrestrial years.
The reason for their returning is that they are our creators and they have deep knowledge of our DNA that they created, and our construction in general and have the power to control us, which is exactly what they were doing for thousands of years.
In the below interview, the whistleblower says that the buzzword in the secrets of secrets in the Pentagon is “The Sumerian gods are returning to Earth”