Avengers: Endgame

2014-2016
This is from the period that Infinity War was advertised as a two-part film series.

2016-Mid 2018


This was only seen during a Disney upfronts presentation.

2018-2019
The long-awaited teaser trailer for Avengers 4 was released on 7th December 2018, officially unveiling the full film title as Avengers: Endgame.