What episode of doctor who is this?

this episode looks like its the final one of the season. it has the doctor looking very old about to die in a bird cage on this space ship where this evil guy is commanding the an army of some sort to destroy earth and the only hope to save the planet is martha. she is brought forward to the evil guy and remembers saying to all the people of the world to think of the doctor at the same time to give him back his youth and killing the evil guy. the episode also had captain jack from tourchwood.