Script for Countdown by Terry Nation directed by Vere Lorrimer (c) 1979 by the British Broadcasting Corporation. Series created by Terry Nation. This is a partial dialogue transcript for research purposes and is not for sale under any circumstances. Format (c) 1993 by Susan Clerc and Micky DuPree. Dramatis Personae: Walk-ons: Derek Suthern Peter Caton Tony Snell Robert Smythe Ray Knight Len Gilbey Ernie Goodyear Peter Roy Toby Byrne NOTE _________ indicates an indecipherable word or phrase. TRONOS Selson. SELSON Sir. TRONOS [Points to the screen on his console] That's the third staircase, isn't it?