all in all a pretty good effort from David Tennant and Billie Piper . the season get off with a mediocre effort , New Earth . Kind of annoy how the doctor treat the cat nurse after all they have do to cure humanity of disease . they have to create guinea pig to experiment they procedure on . I think I would not like this doctor at all . but then a funny thing happen on the way to the finale . the story keep get better and better ! -lrb- up to a point , which you will see . -rrb- School Reunion be just that , bring back two old favorite . after see School Reunion , you will never look at Sarah Jane Smith 's story with Tom Baker 's Doctor the same again . the impossible Planet\/Satan pit sequel be perhaps the strongest effort , contain aspect of the Omen and Alien . then come a slight drop-off in story quality . love and monster can claim to be the strangest , most unusual Doctor who story ever see , not good , but a decent story . follow the Satan pit do not help it in term of excitement . fear she be a pretty weak story with a couple nice moment , such as the doctor light the Olympic torch at the end . just when I think the season hit the skid , along come the tremendous finale , Army of Ghosts\/Doomsday . believe I , this story be fantastic and leave a lasting effect on the viewer . you can feel the Doctor 's sadness at apparently lose Rose forever . it be also nice to see Mickey back again , not the same cowardly Mickey whom the doctor refer to as Mickey the idiot , but a brave freedom-fighting Mickey . do not let a couple weak story spoil the whole season . this be a season that build towards a exciting and heart-wrenching climax .