The last millennium

After the death of his father, Mike is reluctantly enrolled in a new school and is getting into deeper and deeper trouble. Until his class receives a strange visitor who shows how the world is going to end in the third millennium and asks them to prevent this. The only tool the classmates are given is the ability to travel through time. Because according to the scientists of the third millennium, only their class can save humanity and the earth. Will Mike and his friends, teenagers who all have their own problems, be up to this task? Or will the third millennium indeed be the last for humanity?