Continuity
Mrs Wormwood last appeared alongside the Bane in the series one episode "Invasion of the Bane". Commander Kaagh last appeared in the series two story The Last Sontaran. Brigadier Lethbridge-Stewart last appeared in the Doctor Who serial Battlefield, although he had a brief cameo in the charity special Dimensions in Time. This is the first time that Sarah Jane and the Brigadier have met on screen since The Five Doctors, almost exactly 25 years earlier (aside from the 1995 direct-to-video, Downtime).
The Brigadier references several of his previous adventures including Day of the Daleks, The Invasion, Terror of the Autons and Terror of the Zygons. Clyde makes a reference about the events about his dad in The Mark of the Berserker.
The Brigadier refers to the recent change in public awareness of aliens (in episodes such as "Aliens of London", "The Christmas Invasion", "Army of Ghosts"/"Doomsday", and "The Stolen Earth"/"Journey's End"). Sarah Jane mentions that even Queen Victoria knew about aliens. This is a reference to the Doctor Who episode "Tooth and Claw" and the charter of the Torchwood Institute. Like Rose Tyler in "Tooth and Claw", Rani makes a joke about Her Majesty's apocryphal quote, "We are not amused."
The Brigadier has just returned from his trip to Peru; this visit was mentioned in the Doctor Who episode "The Poison Sky" when the Doctor asked where he was. He is said to be back in Peru during the events of "The Wedding of Sarah Jane Smith" and "Death of the Doctor".
Read more about this topic: Enemy Of The Bane
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“Only the family, society’s smallest unit, can change and yet maintain enough continuity to rear children who will not be “strangers in a strange land,” who will be rooted firmly enough to grow and adapt.”
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“Every society consists of men in the process of developing from children into parents. To assure continuity of tradition, society must early prepare for parenthood in its children; and it must take care of the unavoidable remnants of infantility in its adults. This is a large order, especially since a society needs many beings who can follow, a few who can lead, and some who can do both, alternately or in different areas of life.”
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“If you associate enough with older people who do enjoy their lives, who are not stored away in any golden ghettos, you will gain a sense of continuity and of the possibility for a full life.”
—Margaret Mead (1901–1978)