Expanding on our Spaceships Sweet 16 from Episode 398, we've temporarily narrowed the focus to the biggest vessels. Michael and Rob welcome sci-fi comics writer Corinna Bechko and fan extraordinaire Siskoid to help determine the greatest Large Spaceship of All Time. Future episodes will concentrate on Medium and Small ships, leading to the Ultimate match up where we'll pit our Final Fours from each size category against each other.