Ted Cassidy "Battlestar Galactica: The Complete Epic Series" [1978]), Cassidy can be heard providing temporary voice tracks of the Cylon Imperious Leader, before actor Patrick Macnee was contracted to voice the character. Other film work included his appearances in "Butch Cassidy and the Sundance Kid" (1969), "Mackenna's Gold" (1969), "The Limit" (1972), "Charcoal Black" (1972), "The Slams" (1973), "Thunder County" (1974), "Poor Pretty Eddie" (1975), "Harry and Walter Go to New York" (1976), "The Last Remake of Beau Geste" (1977) and "Goin' Coconuts" (1978). He also co-wrote the screenplay of 1973's "The Harrad Experiment", in which he made a brief appearance. In
Damian Cassidy was also on the 7's team that won the All Ireland 7's in 1986. Cassidy won Player of the Tournament at the 1997 Castlewellan 7's, which Bellaghy won. Cassidy retired in 1999. Cassidy won three MacRory Cup medals in 1982, 1983 and 1984 whilst at St. Patrick's College, Maghera (secondary school). He also played hurling for the college and won a Mageean Cup in 1984. Cassidy was Derry assistant manager to Eamonn Coleman from 2000 until 2002. Derry won the National League in 2000 and got to the All-Ireland semi-final in 2001. Following the resignation of Coleman in July 2002,