The 2005 episode featuring the return of the Daleks was “Dalek.”
“Dalek” is the sixth episode of the revived first series of Doctor Who and was broadcast on 30 April 2005. It marked the Daleks’ major return to the television series after the programme’s 1996 television movie and the long absence of a regular Doctor Who series.
The episode takes place in a fortified underground museum in Utah in 2012. Billionaire collector Henry van Statten is holding a damaged Dalek captive, but the creature repairs itself after absorbing Rose Tyler’s DNA. Its renewed ability to feel emotions gives the story an unusual angle: the Dalek experiences fear and compassion while still struggling with its instinct to exterminate.
Viewers sometimes confuse this episode with “The Long Game,” which follows it in the broadcast order, or with “The End of the World,” an earlier 2005 episode. The title “Dalek” is the canonical episode title, not merely a description of its plot.