Nathan Fillion has teased a major "announcement" sparking rumours of Firefly revival.
The 54-year-old actor - who played Captain Malcolm Reynolds in the cult classic space Western show and feature film sequel Serenity - has got fans talking after sharing videos of him visiting former co-stars including Gina Torres (Zoë Washburne), Morena Baccarin (Inara Serra), Sean Maher (Simon Tam), and Summer Glau (River Tam).