Top billing n. The most prominent place in an advertisement or program for a theatrical performance, movie, fundraising affair, etc.; the place where the star's name usually is located.
... a scene in which he shared top billing with Queex and shuddered. All he wanted now was to get free of Terra for a nice, quiet, uncomplicated world where problems could be settled with a sleep rod or a blaster and the ... — Plague Ship • Andre Norton