With reporting by Josh Horowitz

When watching the trailer for "The Last Witch Hunter," one thing becomes immediately clear -- that everyone in it is a graduate or current star of one of the most insanely popular franchises in entertainment history. Like Elijah Wood, for example, who appeared in that movie about the little dudes with the hairy feet... you know the one.

"Game of Thrones" star Rose Leslie ("You know nothing, Jon Snow!") is in there too huntin' witches, with Vin Diesel -- of two franchises, "Fast and Furious" and "Riddick" -- serving as the film's lead.

So with so much franchise-y star power, we just had to quiz all three of them on each others' biggest projects at a recent press day ahead of the film's release. Does Diesel know who knows nothing? Does Ygritte know her Gollum from her Smeagol? Find out above!

"The Last Witch Hunter" hits theaters on October 23.