The opening three episodes to the Third series of the new Doctor Who show how great David Tennant is in the role of the Doctor. Freema Agyeman, who plays the role of Martha, fits into the role well, replacing Billie Piper's character of Rose.
Of the Three Episodes "The Shakesphere Code" is the strongest of the three stories and is just excellent, "Smith and Jones" is also another great story setting up The Doctor & Martha with ease. "Gridlock" is perhaps the weakest of the three but a good story nonetheless.
If you like these three episodes you'll be eager for Volume 2.