One of the more underrated ones is The Time MachineIts about this guy who builds designs a time machine in the year 1900, he then asks the women he loves to marry him but shortly after she dies so he builds the machine in order to go back and save her. The problem is each time he goes back she ends up dying so he decides the only want to save her is in the future and he then begins searching the future for the way to save the women he loves.