Weak point in time
Weak point in time and space, as this is what's quoted in first line.
Talk about it here.
The Ninth Doctor identified the Cardiff Space-Time Rift as a "weak point in time and space". (TV: The Unquiet Dead [+]Loading...["The Unquiet Dead (TV story)"])
A weak point in time was created after Rose Tyler crossed her own timeline when she had the Ninth Doctor take her back to see the car accident which killed her father, Pete Tyler, a second time. When she stepped in to save her father's life, this weak point became a wound in time through which the Reapers came through to sterilise it. They were stopped when Pete, in act of self-sacrifice, allowed himself to be hit by the car that had killed him, which had been suspended in a small time loop after Rose saved him. (PROSE: The Time Traveller's Almanac [+]Loading...["The Time Traveller's Almanac (reference book)"], TV: Father's Day [+]Loading...["Father's Day (TV story)"])
