Time Travel Twins: The Viking Attack

Twins Scarlett and Thomas are studying the Vikings and Anglo-Saxons at school, and have a homework project to do - so Grandad comes to the rescue with his time machine. Thomas is catapulted onto a Viking longship, and it's not long before he's being told tales, fitted out with armour and weapons, and getting ready to fight the Saxons.
But, uh-oh, his sister Scarlett has landed in a Saxon village: i...