1 Anunnaki is a science fiction movie -  the Ancient Sumerian Gods who created the Human Races through Interbreeding

The 1st Annunaki is the story of an Alien Race of Giant hominoids who visited Planet Earth from the 12th Planet (counting the Sun and the Moon) according to the Sumerian Tablets - using cuneiform writing invented in Mesopotamia - which describe how two Annunaki leaders, Enki and his half-sister Ninhursag, produced a hybrid, slave race from the indigenous ape-like peoples of the planet. Hence, an alien “interbreeding program” is central to the Annunaki narrative.

Some researchers do really believe in the Legend, the most well-known being Zecharia Sitchin who was originally an economics historian of the London School. He identifies the Annunaki - “those who from heaven to earth came” as he translates that term - with the Biblical Nefhilim, “the Watchers” of the Book of Enoch. These are alien entities who “came into the daughters of men” as Genesis says.