“The Power of Kroll” is the fifth adventure of the sixteenth season, known by the global title “The Key to Time”, which aired between the end of 1978 and the beginning of 1979. It follows “The Androids of Tara” and it’s a four parts adventure written by Robert Holmes and directed by Norman Stewart.

“The Androids of Tara” is the fourth adventure of the sixteenth season, known by the global title “The Key to Time”, which aired in 1978. It follows “The Stones of Blood” and it’s a four parts adventure written by David Fisher and directed by Michael Hayes.

“The Stones of Blood” is the third adventure of the sixteenth season, known by the global title “The Key to Time”, which aired in 1978. It follows “The Pirate Planet” and it’s a four parts adventure written by David Fisher and directed by Darrol Blake.

“The Pirate Planet” is the second adventure of the sixteenth season, known by the global title “The Key to Time”, which aired in 1978. It follows “The Ribos Operation” and it’s a four parts adventure written by Douglas Adams and directed by Pennant Roberts.

“The Ribos Operation” is the first adventure of the sixteenth season, known by the global title “The Key to Time”, which aired in 1978. It’s a four parts adventure written by Robert Holmes and directed by George Foster-Spenton.