The phrase "inevitable showdown" means a situation where a conflict, competition, or confrontation is bound to happen and cannot be avoided. Full definition
With an updated costume and a stars - and - stripes shield made from impenetrable metal and a taste for vengeance when his friend is killed, Rogers leads the charge in a series of battles leading to the rushed, inevitable showdown with Red Skull. (cinemanerdz.com)
Harry's odyssey, which ends in «Part 2» with the inevitable showdown between Daniel Radcliffe's Harry and Ralph Fiennes's nose - challenged Lord Voldemort, was always pitched as a battle royal between the forces of light and dark. (csmonitor.com)
It's a labored set - up for what everybody wants to see — and what most closely resembles the source material — an inevitable showdown between man and beast accompanied by plenty of urban destruction and with the future of Earth at stake. (cinemalogue.com)