<Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 30, 2002 (2002 - 09 - 30) </Td> <Td> April 28, 2003 (2003 - 04 - 28) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 29, 2003 (2003 - 09 - 29) </Td> <Td> May 7, 2004 (2004 - 05 - 07) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 24, 2004 (2004 - 09 - 24) </Td> <Td> May 6, 2005 (2005 - 05 - 06) </Td> </Tr> <Ul> <Li> "Unleashed"--Yokas and Bosco help Dr. Susan Lewis find her drug - addicted sister . The story begins on ER in the episode "Brothers & Sisters". </Li> <Li> "In the Family Way"--An AWOL soldier arrested for a jewelry - store robbery that left a friend of Sully's dead contracts a virus that begins to spread . The story concludes on Medical Investigation in the episode "Half - Life". </Li> </Ul>

How many seasons were there of third watch