Cast Credits Once Upon a Time (2011) Guest starring as Adopted Little Girl Episode 3x21: Snow Drifts (May 11, 2014) [Co-Star] Supernatural (2005) Guest starring as Delilah Episode 9x10: Road Trip (Jan 14, 2014) [Co-Star] The X-Files (1993) Guest starring as William (6 yr old) Episode 10x02: Founder's Mutation (Jan 25, 2016) [Co-Star]