First episode (2005): "A Hard Day's Night" (Season 1, Episode 1)

Last episode (2014): "Fear (of the Unknown)" (Season 10, Episode 24)

What she's up to now (2020): Sandra currently stars on the critically acclaimed series Killing Eve as Eve Polastri. Her work on the show earned her a 2019 Golden Globe Award for Best Actress in a TV Series, Drama.