During a short war on the planet Messaline between humans and Hath, both sides used progenation machines to instantly create mentally programmed adults from the DNA of single parents. When the Tenth Doctor, Donna Noble, and Martha Jones arrived on Messaline, Jenny was made from a skin sample taken from the Doctor, against his will. However, another warrior was also made: Skuba. Never discovered by humankind and only by the Hath, she was taken in at the young age at which she was created, a glitch in the progenation machine.