K9 Mark I's regeneration
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After K9 Mark I self-destructed, the regeneration unit installed within him initiated his regeneration into K9 Mark 2. (TV: Regeneration [+]Loading...["Regeneration (TV story)"])
Though Jorjie Turner suggested that K9 was not "the same dog" as "the old one", Professor Alistair Gryffen countered K9 had the same brain, only in a new body. (TV: The Bounty Hunter [+]Loading...["The Bounty Hunter (TV story)"])
After being woken up by K9, Starkey told him that humans could not just regenerate, that they needed "actual sleep". (TV: Jaws of Orthrus [+]Loading...["Jaws of Orthrus (TV story)"])
