I hired this out from my video shop.
There are only 2 of the 6 episodes on the disc.
Are the remaining four episodes actually available on DVD?
You had the original BBC version - the other 4 episodes are sadly missing - lost/wiped from the BBC archives.
This thread is for the Hammer movie remake.
There was also a BBC4 remake made in 2004 which was (I feel) only so-so.
This timeline list of title changes and various versions may help:
1953: The Quatermass Experiment (BBC TV 6x30minutes episodes, only the first 2 exsist).
1955: The Quatermass Xperiment (Hammer Film remake, retitled: 'The Creeping Unknown'in the USA).
1955: Quatermass II (BBC TV 6x30minute episodes, all exsist).
1957: Quatermass 2 (Hammer Film remake, retitled: 'Enemy From Space' in the USA).
1958/59: Quatermass and the Pit (BBC TV 6x30minute episodes, all exsist).
1967: Quatermass and the Pit (Hammer Film remake, retitled: 'Five Million Years to Earth'in the USA).
1979: Quatermass (Euston Films 4x60minute episodes, all exsist).
1980: The Quatermass Conclusion (Euston Films shortened edited version of the previous years serial, inteneded for theatrical release in the USA).
1996: The Quatermass Memoirs (BBC Radio 5x20 minute episode radio serial, all exsist).
2005: The Quatermass Experiment (BBC TV televised live, this was staged as a one off drama, released on DVD in the same year).
:)
Steve