The Invasion of Time

097 – *The Invasion of Time*
097 – The Invasion of Time
Doctor Who serial
Cast
	Doctor Tom Baker – Fourth Doctor;
	Companions Louise Jameson – Leela; John Leeson (Voice of K9);
	Others John Arnatt – Chancellor Borusa; Milton Johns – Castellan Kelner; Chris Tranchell – Andred; Charles Morgan – Gold Usher; Hilary Ryan – Rodan; Dennis Edwards – Lord Gomer; Reginald Jessup – Lord Savar; Michael Harley – Bodyguard; Eric Danot, Christopher Christou – Guards; Max Faulkner – Nesbin; Ray Callaghan – Ablif; Michael Mundell – Jasko; Gai Smith – Presta; Stan McGowan, Tom Kelly – Vardans; Derek Deadman – Stor; Stuart Fell – Sontaran;
Production
Directed by	Gerald Blake
Written by	"David Agnew" (Graham Williams and Anthony Read)
Script editor	Anthony Read
Produced by	Graham Williams
Executive producer(s)	None
Music by	Dudley Simpson
Production code	4Z
Series	Season 15
Running time	6 episodes, 25 minutes each
First broadcast	4 February – 11 March 1978
Chronology
← Preceded by; Underworld	Followed by →; The Ribos Operation
	List of episodes (1963–1989)

The Invasion of Time is the sixth and final serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 4 February to 11 March 1978. It features the final appearance of Louise Jameson as the companion Leela.

In the serial, the Vardans break the defences of Gallifrey to allow the Sontarans to invade and control the power of the Time Lords.