We are going through all of the stories of Doctor #4 and #10. Tom Baker is the Doctor for 2 episodes. Tonight's Story is Planet of Evil episodes 3 and 4 with companion Sarah Jane Smith. (DVD)
David Tennant (Doctor #10) is the Doctor in The Christmas Invasion directly after the two episodes of Doctor #4.
The Sarah Jane Smith story The Wedding of Sarah Jane Smith will start the evening and will include David Tennant as The Doctor!