Season 3

The Doctor, still smarting from the loss of Rose Tyler, attempts to take Donna back to Earth in time for her wedding. Upon arrival in London, the Doctor and Donna have difficulty getting back to the church without money for the taxi fare. But outside Henrik's department store, the Doctor sees the same Santa Claus band he saw the previous Christmas (in the episode entitled "The Christmas Invasion") and realizes something strange is going on. Nevertheless, Donna borrows money from a shopper and enters a taxi... which has been commandeered by one of the 'pilot fish' robots. The Doctor makes a daring rescue of the woman from the TARDIS, hovering over the metroway.