S12 · E10
The Doctor learns that Styre has been experimenting on the Galsec crewmembers to pave the way for a Sontaran invasion of Earth and decides the only way to halt his plans is to challenge him to a duel.
S12 · E01
Dec 28, 1974 · 25m
S12 · E02
Jan 4, 1975 · 25m
S12 · E03
Jan 11, 1975 · 25m
S12 · E04
Jan 18, 1975 · 25m
S12 · E05
Jan 25, 1975 · 25m
S12 · E06
Feb 1, 1975 · 25m
S12 · E07
Feb 8, 1975 · 25m
S12 · E08
Feb 15, 1975 · 25m
S12 · E09
Feb 22, 1975 · 25m
S12 · E10
Mar 1, 1975 · 25m
S12 · E11
Mar 8, 1975 · 25m
S12 · E12
Mar 15, 1975 · 25m
S12 · E13
Mar 22, 1975 · 25m
S12 · E14
Mar 29, 1975 · 25m
S12 · E15
Apr 5, 1975 · 25m
S12 · E16
Apr 12, 1975 · 25m
S12 · E17
Apr 19, 1975 · 25m
S12 · E18
Apr 26, 1975 · 25m
S12 · E19
May 3, 1975 · 25m
S12 · E20
May 10, 1975 · 25m