The "King of the Bs", Roger Corman, produced and directed The Raven (1963) for American International Pictures.
Vincent Price headlines a cast of veteran character actors along with a young Jack Nicholson.
Two "major-minors"—Universal Studios and rising Columbia Pictures—had production lines roughly similar to, though somewhat better endowed than, the top Poverty Row studios.
A new programming scheme developed that would soon become standard practice: a newsreel, a short and/or serial, and a cartoon, followed by a double feature.
The second feature, which actually screened before the main event, cost the exhibitor less per minute than the equivalent running time in shorts.
With the B films rented at a flat fee (rather than the box office percentage basis of A films), rates could be set virtually guaranteeing the profitability of every B movie.
The parallel practice of blind bidding largely freed the majors from worrying about their Bs' quality—even when booking in less than seasonal blocks, exhibitors had to buy most pictures sight unseen.