The Sound of Drums
The planet makes its first appearance in the revived series in "The Sound of Drums" (2007), where the Citadel, enclosed in a glass dome (as described by the Doctor in "Gridlock", 2007), is seen in flashback as the Doctor describes it. Also seen is a ceremony initiating 8-year-old Gallifreyans – in particular the Master – into the Time Lord Academy.