Episode SixSeries Episode Number: 343
World Premiere: Sat 31 Mar 1973 - 5:52pm BST [BBC One] (United Kingdom)
Running Time: 24 minutes 44 seconds
8.90 Million (UK)
Chart Position: 40 () (UK)
Recorded on Tue 31 Oct 1972 in TC3
Archive State: PAL 2 VT
The Doctor leads a mission to the Ogron home world to apprehend the Master and rescue Jo. But the Master is in league with some old enemies of the Doctor.