If you go to the movies and watch films , time travel is often introduced in the stories . For example , one of the most famous movies of all time “ Avengers 4 : Endgame ” includes the concept of time travel . In the movie , Antman , a hero who communicates with ants and shrinks in size , figures out a way to travel to the past . Using this method , the Avengers acquire a chance to go back to the time before Thanos invades the Earth . He is the main villain and they must save the world .