Ken is the newest official member of A Disused Yeti.
We picked him up on Raxacoricofallapatorius after he had been inadvertently stranded there by the leather jacket clad Doctor following a sonic mishap.
Since then he had been traveling with cat companion Pickles (code name: Muffin). Together they had rewired a signal to Earth. Unfortunately, it was tuned to the future. A Ms. Martha Jones managed to patch him through to us and the rest is re-written history.