When the news came that ex-ER star Anthony Edwards was going to return to the show for an episode this last season, fans wondered how that could happen, since he died (and we mean really died, not soap opera died) of a brain tumor around 6 years ago. Would he be a ghost? A hallucination only a patient can see? Would he be Mark's long-lost twin brother (Matt, or maybe Monty) who comes to work at County because his brother worked there? The news that Dr. Mark Greene is going to interact somehow with new doctor Cate Banfield (Angela Bassett) just makes the scenario more confusing.

But now we have our answer. Edwards tells the AP that Mark will be shown via flashback in an ER story we haven't seen before.