User blog comment:Ygrain/EDI and the geth: their purpose in the story?/@comment-3581090-20120727155928/@comment-5337704-20120729114424

Im playing through my mass effect 2, the undercover agent from Noveria mentions she was going undercover to research Dark Matter, So her and when you meet tali, is about the only time its mentioned so far outside of the codex, perhaps (i know wishful thinking) they will make that the main story line of the next few mass effects, tieing the first two games to that series, as this one was mainly about shepard facing the reapers, reapers were never mentioned having anything thoughts on the dark matter problem itself, unless I am mistaken.