Killgrave. They didn't actually call him "The Purple Man" on the show. And he wasn't purple, which, good. Also, that's probably him clapping at the end, as Tennant IS back for season 2. My hope is he won't be there for much of it, and it'll be flashbacks or other trauma related hallucination. Because I don't want Jessica's story to be ABOUT him. I want it to be about her.