Lucy (Rise of the Cybermen)

Lucy was a servant of Peter and Jackie Tyler in a parallel world, known as Pete's World. She served salmon pinwheels to Jackie's guests at her 40th birthday party. While talking to the Tenth Doctor, she told him of the identity of one particular guest- the President of Great Britain. When he relayed this information to Rose Tyler, she commented that Lucy might be a bit thick due to coming from an alternate universe where Britain had a Prime Minister instead of a President. Lucy was terrified when the Cybermen literally crashed the party, killing the President and several guests, and she ran screaming from the room. Whether she was killed by the Cybermen, upgraded into one or escaped like some other guests is unknown, though if she survived it can be assumed that she continued to work for the Tyler family. (Rise of the Cybermen)