Captain Jack Harkness is forced to use his own grandson, Steven , as a transmitter to send a signal that destroys the 456 aliens.
In this intense season finale (of the initial disaster arc), the evacuation of Memorial Medical Center reaches its breaking point five days after hit New Orleans.
Devastated by the loss of his family and teammate Ianto Jones, Jack leaves Earth on a spaceship, effectively disbanding Torchwood. 🦘 Other Series with a "Day Five" (S1E5)
Butchie tries to reunite Shaun and Tina, while John helps other characters confront their pasts.
While technically the fifth episode of Season 3, this is often cited as a "Season 1" equivalent for the Children of Earth miniseries format.
The signal successfully repels the invaders but kills Steven in the process.