. "Lost the Jethrik - Doctor Who - The Ribos Operation - BBC"@en . "The Ribos Operation (TV story)"@en . . "16"^^ . . . . . "A most harrowing experience - Doctor Who - The Ribos Operation - BBC"@en . "98"^^ . . "The Ribos Operation"@en . . "4"^^ . . . "The Pirate Planet"@en . . . "4"^^ . "All four parts of The Ribos Operation ran over the allocated time, so a significant amount of material was cut for the broadcast version. Some of this material was retained in Ian Marter's novelisation. There was much debate as to whether K9 should return after the problems the prop had caused in season fifteen. The character was popular with younger audiences so, with the assurance that the new prop was more efficient, Graham Williams approved the introduction of K9 Mark II. Tom Baker's lip was cut in an accident in which a dog bit him. This meant he had a visible sticking plaster upon his face in the publicity stills for this story. The scar from the injury remained visible in much of this and subsequent stories. The Ribos Operation was notable for seeing a number of debut appearances. It was the first serial to feature Mary Tamm as companion Romana and was also the first to properly feature K9 Mark II. The White Guardian also made his debut. He was not seen again until Enlightenment, though his voice was heard in The Stones of Blood."@en . . . . . . . "--09-23"^^ . "All four parts of The Ribos Operation ran over the allocated time, so a significant amount of material was cut for the broadcast version. Some of this material was retained in Ian Marter's novelisation. There was much debate as to whether K9 should return after the problems the prop had caused in season fifteen. The character was popular with younger audiences so, with the assurance that the new prop was more efficient, Graham Williams approved the introduction of K9 Mark II."@en . . . . . . . "Fourth Doctor"@en . . . "Doctor Who and the Ribos Operation"@en . "5.0"^^ . . . . . "The Invasion of Time"@en . . . .