Production of the first series was cut short by a strike. By the time production could begin on the second series, Hendry had quit to pursue a film career. Macnee was promoted to star and Steed became the focus of the series, initially working with a rotation of three different partners. Dr Martin King (Jon Rollason), a thinly disguised rewriting of the Keel character, saw action in only three episodes, which were produced from scripts written for the first series. King was intended to be a transitional character between Keel and Steed's two new female partners, but while the Dr. King episodes were shot first, they were shown out of production order in the middle of the season. The character was thereafter quickly and quietly dropped.