The phrase "dramatic showdown" refers to a highly intense and exciting confrontation between two or more people or groups, often characterized by strong emotions, tension, and a lot of action. Full definition
His most dramatic showdown came with Steve Croman, whom he branded the «Bernie Madoff of landlords.» (therealdeal.com)
Luhrmann... confirmed he'd found his man: «In casting Tom one had to find an actor who could credibly be (as Fitzgerald describes him) «one of the most powerful ends that ever played football at New Haven,» had five - star acting chops and in the big dramatic showdown scenes between Gatsby and Tom, hold the screen against Leonardo DiCaprio, in the appropriate age group. (theatlantic.com)
The movie gets a little lost trying to justify his being the only bad guy and the final dramatic showdown suffers from this confusion in a way the film's other action sequences do not. (lwlies.com)