Boffin Boy and his friend Katt are on a mountain-climbing trip in Scotland when they come across a mysterious Yeti. They wonder why it's there and if it's also on holiday. With the help of Wu Pee, they investigate and stumble upon a time gate in the mountains. They decide to follow the Yeti through the gate, but soon realize they're trapped in a different time period with no way back to their own time.
