Is an internet connection required to play Marvel’s Avengers?
You will need to connect to the internet one time in order to download the game’s day-one patch. The patch is approximately 18GB in size. If you have purchased the game digitally, you will receive the patch along with the game’s initial download.
After the day-one patch download is complete, an internet connection will not be required to play the game solo, although you’ll need an active internet connection to play online co-op, download post-launch content including new heroes, new missions, and new regions for free.