Streaming Services:
* BBC iPlayer: This is the most accessible option for UK viewers, as it's the BBC's own streaming service.
* BritBox: A streaming service that focuses on British TV shows, including Doctor Who. This is a good option for viewers outside of the UK.
* Amazon Prime Video: Some regions offer the Doctor Who series, including David Tennant's episodes, through Amazon Prime Video. You can check the availability in your region.
* Other Streaming Services: Depending on your location, other streaming services like Netflix, Hulu, or HBO Max might offer Doctor Who episodes, but availability varies.
DVD and Blu-ray:
* You can purchase physical copies of the episodes on DVD or Blu-ray from retailers like Amazon, Target, or Walmart.
Note: Availability and prices may vary depending on the region and platform. It's best to check the specific platform or retailer for the most up-to-date information.
Specifically, David Tennant's last episodes as the Doctor are:
* Season 4, Episode 13: "Journey's End"
* The Christmas Special 2009: "The Next Doctor"
* The Christmas Special 2010: "A Christmas Carol" (special guest appearance)
The "Next Doctor" episode was originally meant to be a one-off special, but due to David Tennant's popularity, he was asked back for another episode.