sentences:  Model filming was conducted at Bray Studios between 8 May 1979 and 10 May 1979.These concentrated on the shots of the Jagaroth spacecraft taking off from the prehistoric Earth and were overseen by Ian Scoones, a veteran of Gerry Anderson's "Thunderbirds".Following rehearsals, production moved to BBC Television Centre where the remaining scenes were recorded in two blocks; the first between 21 May 1979 and 22 May 1979 and second between 3 June 1979 and 5 June 1979.