User blog comment:Arbington/ME3 Theories/@comment-2161169-20100712121154

the Keepers — now that's one worth looking into. did anyone bother doing the scan-the-keepers mission in ME1? and then emails and teammate comments and Thanes mission in keeper-land? i could certainly believe Ralok's idea that the Citadel would be a huge boss fight simply because those Keepers um, keep everything running in some mysterious way and certainly have no other story yet. for all we know, the Shadow Broker could be working for them