Cosmonauts:
    Upload:
        Gennadi Padalka [2], Commander
        E. Michael Fincke [1], Soyuz Crew Member (USA)
        André Kuipers [1], Flight Engineer (ESA/Netherlands)
    Download:
        Gennadi Padalka
        E. Michael Fincke
        Yuri Shargin
Backup:
    Saliszan Sharipov
    Leroy Chiao (USA)
    Gerhard Thiele (ESA/Germany)
Launch:
    Date: 19 April 2004
    Time: 03:18:57 UTC
Landing:
    Date: 24 October 2004
    Time: 00:35:09 UTC
Duration: 188 days, 21 hours, 16 minutes
Docked: 21 April 2004 - 23 October 2004
Call Sign: Altair

Soyuz-TMA 4 is the replacement for Soyuz-TMA 3 The Soyuz is used as a lifeboat for the ISS. Because of fuel degradation, the Soyuz needs to be replaced every six months.