DG tests a series of DC stories against the official comics bunker Crisis Rubric: 

1- At least 2 teams that  do not usually interact with each other- ideally from different time periods or universes- must interact. 

2- A situation that threatens the status quo of one or both teams must occur. 

3- Either a new character that spans the realities of both teams must be introduced, or the "death" of an established character must occur.