Synopsis: The Doctor (in his 3rd Incarnation), is still exiled on Earth thanks to the High Tribunal of Time Lords. The TARDIS doesn't seem to be working, and the Doctor has new responsibilities working for a group known as UNIT. He also has a new assistant, Jo Grant. Meanwhile, back on the Time Lord planet of Gallifrey, the location of the Doomsday Weapon, a device of unimaginable power, has been uncovered by the renegade Time Lord and the Doctor's enemy, the Master! So, the Time Lords lift the Doctor's exile on Earth temporarily so he can stop this new threat in the year 2417. But, unfortunately, there are other foes to tangle with...
Review: When you pick up Doctor Who and the Doomsday Weapon, you may be a little confused.
If you read the Doctor Who Television Adaptation series in order, you will discover the previous book, The Day of the Daleks takes place after this story. The Doctor knew Jo Grant pretty well in that story, but at the start of this, he hardly knows her.
Anyway, what did I think of this story? Pretty good. Alot of characters are in this one, all are focused on and the expendable ones are killed off, of course! There are three groups in this story, and so much conflict between them. There's the settlers on the barren desert planet the Doctor and Jo have been transported to; the IMC, a coropration from Earth that want the settlers off and the planet used for industrial purposes; then there are the Primatives, the original natives of the planet. They are VERY important later on.
But if you are looking for alot of the Master, you may be disappointed. The Master doesn't seem to appear till much later on, and seems more a subplot and plays second fiddle to the real story (the same goes for the Doctor, sort of). The real story is the conflict between the IMC and the settlers that, while interesting, gets tiring toward the end. But, I suppose, at the end of the day, The Doomsday Weapon is a good way to pass the time.
NOTE: This is another one that is out of print, but again, you can find it used if you really want it!
Title: The Doomsday Weapon