Helios 5
From Tardis Wiki, the free Doctor Who reference
Helios 5 was visited by the Tenth Doctor and Donna Noble. The Doctor later speculated to Donna's grandfather Wilfred Mott that it could have been one of the places Donna met a Verron who gave her a medal she sent to Wilfred, telling him that he "had to be there". (PROSE: Beautiful Chaos)
