Tong then approached Sammo Hung, a good friend and occasional co-star of Chan's. Still eager to fill the 9 pm program slot, CBS agreed very quickly and production began on the series. After the first six episodes had aired, they knew it was a hit. The production, however, was not without complications, as Hung was used to the control over filming he had in Hong Kong and was not fluent in English. Hung was not delighted to be filming in early mornings and late night that American television productions require.