https://www.cnet.com/news/catch-up-before-avengers-infinity-war-what-to-know-about-mcu/

We're pretty sure our idea of the Avengers will be drastically altered on April 27 when Avengers: Infinity War finally hits theaters. We've recently learned that the newest Marvel Cinematic Universe film will be 149 minutes, making it the longest Marvel universe movie to date.

Because that's quite an investment, we want to help you go into it uber prepared. Since you've probably already gone through our huge MCU timeline previously and now only have a weekish before Infinity War opens, we've mapped out an easy refresher on all things MCU and Avengers -- or to use as a crash course for your friend who wants to tag along to the biggest film event of the year.