After Tennant's three specials, there will be a new Doctor taking over the Tardis, played by Ncuti Gatwa.

Source: https://www.bbc.co.uk/news/entertainment-arts-67498029?at_medium=RSS&at_campaign=KARANGA

BBC shared unused takes of David Tennant's emotional final line on Doctor Who in 2010, during the moment when his Tenth Doctor had to say goodbye.

Source: https://screenrant.com/doctor-who-10th-doctor-final-line-alternate-takes-video-regeneration/

Being a cheerleader for Margaret Thatcher is unlikely to have been high on David Tennant's bucket list.

Source: https://www.dailymail.co.uk/tvshowbiz/article-12474711/David-Tennants-demanding-role-Labour-supporting-Doctor-star-lands-seen-cheering-late-Prime-Minister-Margaret-Thatcher-scenes-Rivals-adaptation.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

David Tennant's Doctor will take centre stage in three specials we previously learned will be titled "The Star Beast," "Wild Blue Yonder," and "The Giggle."

Source: https://comicbookmovie.com/tv/bbc-america/doctor-who/doctor-who-trailer-for-60th-anniversary-specials-reveals-donna-nobles-fate-and-the-celestial-toymaker-a205823

Holiday Special followed David Tennant's run as the Fourteenth Doctor in three Doctor Who 60th-anniversary specials.

Source: https://comicbook.com/tv-shows/news/doctor-who-who-is-ruby-sunday-new-companion-millie-gibson/

Much like the "Doctor Who" specials that aired back in 2009 for the build-up to David Tennant's first departure, these are very much their own separate thing.

Source: https://www.slashfilm.com/1328978/doctor-who-season-14-release-date/

The highly anticipated story was filled with emotional peaks and valleys, and its final scenes saw one of Tennant's most emotional performances to date, having to heartbrokenly return Donna to her family with her memories wiped.

Source: https://screenrant.com/doctor-who-david-tennant-best-performances-ranked/