The Doctor is alive and the Shanseeth seek to rectify their mistake of having a funeral without a proper dead body by trying to kill the doctor. Sarah has her hands tied this time, she's needed heavily by the docgor since the shansheeth kept the doctor's screwdriver in the tardis. Sarah learns out much out the doctor'd life after her when she finishes this adventure. many of the doctor's ex companions have been trying to improve society just like their time lord mentor; ranging from Ian chesterson to Ace Mcshane.
"With freinds like us, he's never really going ot die is he?" - sarah