Gog and Magog will emerge in huge numbers and spread mischief on earth and no one will be able to resist them. The Antichrist will spread corruption on earth and will claim divinity, calling on people to worship him. The Beast will speak to mankind and exhort them, having the ability to reason and speak

Yajuj and Majuj are two huge nations of the sons of Adam. They exist at present, and they are attempting on a daily basis to get out and attack people. For more, see the detailed answer.