 The original British release billed Brian Donlevy (qv) and  Jack Warner (I) (qv) before the main title (The Quatermass  Xperiment), with Margia Dean (qv) heading the supporting cast  after the title. For the US release, Donlevy, then Ms. Dean, and  then Warner were billed before the main title (The Creeping  Unknown), moving Thora Hird (qv) up to the top of the supporting  cast, the remaining order of which was not changed. Also,  Val Guest (qv) did not receive co