I’m guessing that whoever Dr. Whale is, he is going to be on the same side as Regina. We’ve already seen him calling Regina whenever something happens to David Nolan. Dr. Whale had a one-night stand with Mary Margaret, which makes me think he tried to keep David and MM apart. We’ve also seen him looking lecherously as Ruby. There is something seriously sinister about him.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy