He supposed the Doctor would have built a third K-9 before now, but for his attempts to get Tegan home. It looked ready to go, but the Doctor wasn't activating it - he was just staring at it.
While Adric was deciding whether to enter the Doctor spoke to him. "You know, I've said goodbye to K-9 twice now. I hate goodbyes."
Adric walked up to him. "Pity to let it go to waste though."
"Right," said the Doctor. "There's a packing crate here somewhere ..."
THE END