Alec W. answered 10/30/19
Film Industry Professional, Editing, and Graphics Animation Tutor
Typically an opening sequence like this would be called an opening title sequence. Prologue works too, but I would use that term only if I was talking about the opening part to a story rather than to define an edited sequence with titles. In the case of Batman v Superman: Dawn of Justice I would probably classify the opening as a montage sequence. Here is the definition of montage according to the New York Film Academy student resources glossary: "Editing a sequence of shots or scenes together in a continuous sequence to more quickly convey information over a period of time." Source link: https://www.nyfa.edu/student-resources/glossary/#M
Often times a lot of montage sequences won't have dialogue, they will just show a lot of shots of characters performing actions over a period of time.
I hope that answers your question!
Thank you,
-Alec