The Crew of STS-121 Discovery.

Row 1:	Mission Commander: Pilot:	Steve Lindsey Mark Kelly	biography biography	interview interview.
Row 2:	Mission Specialist: Mission Specialist: Mission Specialist: Mission Specialist:	Mike Fossum Lisa Nowak Piers Sellers Stephanie Wilson	biography biography biography biography	interview interview interview interview.
Row 3:	ESA Astronaut (ISS):	Thomas Reiter	biography

NASA 2006 Pre-Flight Interviews - STS-121 Discovery:

Image credits: NASA / ESA (Reiter).

NB: the Shuttle in the above image is Atlantis, being rolled out in readiness for either the STS-121 mission, or as a potential rescue vehicle for the crew of STS-114 Discovery.

Atlantis was originally scheduled for STS-121 until 08/18/05, when it was announced that Discovery was to be used instead, and NASA said that STS-121 would be postponed until March 2006.

STS-114 was the 114th Space Shuttle mission¹; STS-121 will be the 115th; after STS-121 will follow STS-115, the 116th mission. - The mission numbers are assigned originally in the correct sequence, e.g, 114, 115, 116..., but the missions sometimes get shuffled around, although they keep their original numbers.

¹ not including the eight STS ALT test flights in 1977.