Jenny is the daughter[1] of the series protagonist the Doctor, a product of altered DNA extracted from a tissue sample of his tenth incarnation's hand.

Georgia Tennant (then-Moffett) was cast as Jenny after auditioning for a smaller part in the episode "The Unicorn and the Wasp", and impressing the series producers.

Born a fighter, with combat skills and tactics automatically programmed, she is initially ideologically at odds with the Doctor's pacifism, but after learning she has two hearts and is connected to the near-extinct race of Time Lords, she begins to pattern her behaviour on that of her father.

As executive producer Russell T Davies stated, when discussing the creation of Jenny as the Doctor's newest family member: "In the current series once or twice we've had fleeting little mentions, he said to Rose in the TARDIS in "Fear Her" that he'd been a father once.

"[9] Regarding the creation of the character Jenny, series producer Phil Collinson explained, "It came out of a desire to keep pushing David, and keep taking him in new directions, and keep challenging him, really.

"[9] Moffett has agreed that giving the character a daughter was "an interesting, emotional, dramatic place for the character to go,"[9] while the episode's writer, Stephen Greenhorn, has spoken of the manner in which creating Jenny allowed the show to broach "aspects of the Doctor's past life that we don't often get to discuss, about his previous family that he had and lost in the Time War.

"[15] Initially, Jenny is portrayed as an "action hero" character,[15] described by series producer Phil Collinson as: "a warrior.

Tennant explained that her character: "begins to become much more like the Doctor, and much more like a Time[lord],"[7] describing the episode as "a journey,"[9] over the course of which Jenny learns to use her fighting skills "in the right way," developing morals as she grows on a personal level.

[3] He describes the act of reviving the character at the end of the episode as "a pretty cheap trick", but asserts that; "this is outshone by the big surprise at Jenny's career-choice at the conclusion of The Doctor's Daughter.

"[9] Despite reviewing the episode "The Doctor's Daughter" poorly as a whole, Digital Spy's Ben Rawson-Jones argues that Jenny "deserved a stronger narrative context for her debut", and that Georgia Moffett portrayed the character with "the right spirit, arrogance and compassion that befits a sprog of the Time Lord.

"[18] Ian Berriman, writing for SFX, is somewhat more critical of the character, stating: "we're not given much time to get to know Jenny (and you always suspect she's a redshirt), so her "death" is not as affecting as it could have been.

"[4] The Stage's Mark Wright is similarly critical of the character and her conception, writing: "I'll admit to feeling cheated that she isn't the real thing and it's a bit of techno-gubbins malarkey to give the Doctor something to emote against.

[19] In 2008, critics Anderson, Berriman, Wright, and The Times' Andrew Billen all speculated that the character could return to the series in the future,[3][4][5][6] with Anderson assessing that Jenny's episode's ending left "vast scope" for the return of the character in her own spin-off: "Moffett herself has the obvious credentials due to her real-life dad, and she's certainly young, attractive and athletic enough to cross quite a few barriers in viewer demographics.