Originally Posted by
Tritagonist
ME2 and ME3 don't really flow into each other at all, unless you're doing a lot of filling in the blanks. Arrival offers you the chance to stop an imminent Reaper invasion, after which Admiral Hackett of the 5th Alliance fleet will tell you that you'll have to defend yourself on Earth because of the methods used to stop that invasion. You can just ignore that throughout the entire game, though, and keep going along with your new Cerberus buddies; nothing comes of it. Then in ME3, at the start of the game you're suddenly on Earth, supposedly having handed over the Normandy to the Alliance, the ME2 crew has all left, you've been incarcerated for a few months and... well, I suppose it's one big 'buy our books/comics' situation.