David Tennant and Catherine Tate are back on Doctor Who. It has been 15 years since the Tenth Doctor and Donna Noble concluded their travels through time and space with one another -- an adventure that came to a tragic conclusion in 2008's Season 4 finale, "Journey's End." Now, Tennant is returning as the older and wiser Fourteenth Doctor, while Tate is picking up Donna's story in the midst of her new life with her new family. Their reunion is an unexpected one for them both, but also a potentially deadly one. When Donna last left the TARDIS, the Doctor had to wipe her mind to save her life. Now, remembering him could prove fatal to Donna.
Source：https://www.cbr.com/doctor-who-donna-noble-the-star-beast/
