The 16th season of
Doctor Who commenced on September 2, 1978, with episode one of the four-part "The Ribos Operation."
Cyril Luckham appears as the White Guardian, who orders the Doctor (
Tom Baker) to restore the balance between Good and Evil. To do this, the Doctor must locate and reassemble the missing segments of the Key to Time. Not only does this introduce an epic quest that will continue throughout the season, but it also serves to provide the Doctor with an attractive new companion: Time Lady Romana, played by Mary Tamm. "The Ribos Operation, Episode 1" was written by Robert Holmes. ~ Hal Erickson, All Movie Guide