Tonja Walker, who played Julian’s sister (and Anna’s archenemy) Olivia Jerome from 1988-90, is returning to Port Charles in early 2017, the show confirms. “We are very happy to be bringing Tonja back to GH. While we can’t share what role she’ll be playing, we can guarantee that she’ll be shaking things up in Port Charles,” said Frank Valentini, executive producer, in a statement.