You can watch this episode with Disney+ or find it on Tardis Wiki .
" The Christmas Invasion " is the first Christmas special of the revival era of Doctor Who , acting as the first full appearance of David Tennant as the Tenth Doctor following his regeneration in 2005. The episode sees Rose Tyler managing the aftermath of an alien invasion by the Sycorax, who threaten the planet while the Doctor is recovering. The special is notable for establishing the annual holiday tradition for the show and featuring a climactic sword fight over London. [S2E0] The Christmas Invasion
"Doctor Who" The Christmas Invasion (TV Episode 2005) - IMDb You can watch this episode with Disney+ or