In Arrow Season 7 Ep. 16: Star City 2040, Mia (guest star Katherine McNamara) and William (guest star Ben Lewis) venture into the Glades on a dangerous mission. There they run into Dinah (Juliana Harkavy), Roy (Colton Haynes) and Zoe (guest star Andrea Sixtos) who deliver some devastating news. The flash forwards share highlights from Mia’s childhood with Felicity (Emily Bett Rickards)…