Netflix has tweeted out a mocking joke of Thanos' changing appearance over the course of his run in the Marvel Cinematic Universe.
Take a look;
doctors hate him! local dad's transformation has half the world in shock pic.twitter.com/9vEMvqSgj4— Netflix US (@netflix) May 3, 2018
Thanos debuted in 2012's The Avengers, played by Damion Poitier. After that, Josh Brolin took over the role - including his major role in this year's Avengers: Infinity War. Between different actors and changes in how Marvel Studios wanted the character to look, Thanos has evolved over time.
Netflix, of course, has a deal with Marvel Studios to stream several of its previous movies - but The Avengers isn't one of them.