Read the following passage and answer if the question is true or false.
Passage: The character appears in various Marvel Cinematic Universe films, including The Avengers (2012), portrayed by Damion Poitier, and Guardians of the Galaxy (2014), Avengers: Age of Ultron (2015), Avengers: Infinity War (2018), and the fourth Avengers film (2019), portrayed by Josh Brolin through voice and motion capture. The character has appeared in various comic adaptations, including animated television series, arcade, and video games.

Question: was thanos in the first guardians of the galaxy?

Is the answer True or False? Respond with only "True" or "False" and no additional text.
False.