Do you want to compare Captain Britain with Sif? Discover the powers, weakness & weapons of Captain Britain and Sif from Captain Britain Biography and Sif Biography. Find out all about Captain Britain and Sif.# Check out how is Captain Britain unique and distinct from Sif. Discover their love interest, sidekicks, family tree and the movies and games list in which Captain Britain and Sif have appeared. Find out everything about them here!