In the end of Kali Yuga, Lord Kalki, the 10th avatar of Lord Vishnu will incarnate on earth. He will be mentored by Parshurama and Hanuman. He will destroy all evil and defeat the Demon Kali, the master of Kali Yuga and establish peace and dharma. He will live with some enlightened beings for some years on this earth and then the pralaya which occurs in the end of a Mahayuag will takes place (Mahayuga means the sum of the 4 yugas; Satya Yuga, Treta Yuga, Dvapara Yuga and Kali Yuga). In this pralaya the earth will be submerged in water and the enlightened people will be saved by the Matsya avatar of Vishnu and after that a new Satya Yuga will begin followed by another cycle of Mahayuga. The third eye of Shiva will not open in the end of Mahayuga. It will open in the end of the life of Bramha when all 14 realms will be destroyed by his Tandava. Bramha lives for 100 years. 1 day of Bramha= 1 Kalpa 1 Kalpa= 14 Manvantars 1 Manvantar= 71 Maha Yugas 1 Maha Yuga= 4 Yugas= Satya Yuga, Treta Yuga, Dvapara Yuga and Kali Yuga. Thats not how it's going to happen, if you are expecting an end like that sorry for disappointing you. As we knew, we are in Kali yuga the last yuga of the life cycle(of a mahayuga) the origin date of kali yuga is in Feb of 3201 BC, the other yuga are satya yuga, tretha yuga, dwapara yuga, the kali yuga is associated with demon kali which means strif, querrel. At the starting of satya yuga every manifestation or work is close to the purest ideal and It is often referred as the "Golden Age". The Satya Yuga lasts 1,728,000 years. The goddess Dharma (depicted in the form of cow), which symbolises morality, stood on all four legs during this period means people used to live with truth and honesty, binding by the laws. Treta yuga the second of the yugas.The holy mythology of Ramayana happend in this yuga also lord vishnu incarnated two more avatars as Vamana and Parashurama . The name could also be derived from the fact that the Treta Yug lasted 3,600 divine years, or 1,296,000 human years. Darma stood with three legs during this period. Dvapara yuga the third of the yuga, this yuga ended at the moment when krishna returned to Vaikunta. According to the bhagavatam, the Dvapara Yuga lasts 864,000 years. Now comes the Kali yuga,In kali yuga everything will be in its peak form. Entire human race loses spirituality hence it is referred as Dark age, morality is reduced to only a quarter of that of the golden age(satya yuga), so that the Dharma runs on only one leg. Neither lord shiva opens his third eye nor kalki destroy with a sword…. Its us who is going to end the human race, people are filled with the features of demon kali like pride, neglegance, lust ,thirst for power, thirst of supremacy,these will lead in to global destruction most probably global warming or world war 3 which will kill 70% of world population directly rest will die with side effects of the war, its just a matter of time. Peace✌