When to Watch: Sunday, Sept. 29 at 8 p.m.What to Expect: JoAnna Garcia will be swimming on to OUAT as our highly-awaited underwater princess Ariel, while Rose McIver will don sparkly wings as Tinkerbell. Both of these ladies will make their magical debuts in Neverland, a place that the Once creators describe to us as "a place that makes you confront your past. It's sort of the heart of darkness." And unlike the stories we knew growing up Peter Pan is "a man we should all be frightened of." Yikes!