The Dagmar Cluster was a location "two and half galaxies away" from Mickey Smith's home in Mutter's Spiral. The SS Madame de Pompadour broke down in the Dagmar Cluster and was partially repaired by the Clockwork Droids. It was later visited by the Tenth Doctor, Rose and Mickey. (TV: The Girl in the Fireplace [+]Steven Moffat, Doctor Who series 2 (BBC One, 2006).)
On 11 January of an undisclosed year in the 51st century, the Dagmar Cluster hosted the great spaceship race. Those in attendance were advised to beware ion storms and cannibal spaceships. (PROSE: Time Traveller's Diary [+]Chris Farnell, BBC Children's Books (2020).)