<Li> Alyson Hannigan as Lily Aldrin, a kindergarten teacher, aspiring artist, and Marshall's wife . She is terrible at keeping secrets and can be manipulative at times . She marries Marshall in season 2 and gives birth to Marvin in season 7 . Though appearing sweet and cute, Lily can be quite unexpectedly fierce . Alyson's husband Alexis Denisof has appeared on 10 episodes on the show as Sandy Rivers . </Li> <Li> Cristin Milioti as Tracy McConnell (guest - season 8; main - season 9), (although only appearing customarily, 28 episodes out of 208, she plays an integral part in the show in the build - up to the finale) the future wife of Ted Mosby, The Mother . Tracy McConnell is first seen in the finale of season 8, though her name is hinted at season 1 (01x09 "Belly full of Turkey") and officially revealed in the series finale . Ted falls madly in love with her, but in 2024 she passes away . </Li> <Li> Bob Saget as Future Ted Mosby (voice only, uncredited), Ted's future self, telling his children the story of how he met their mother, in the year 2030 . </Li> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 19, 2005 (2005 - 09 - 19) </Td> <Td> May 15, 2006 (2006 - 05 - 15) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 18, 2006 (2006 - 09 - 18) </Td> <Td> May 14, 2007 (2007 - 05 - 14) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 20 </Td> <Td_colspan="1"> September 24, 2007 (2007 - 09 - 24) </Td> <Td> May 19, 2008 (2008 - 05 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 22, 2008 (2008 - 09 - 22) </Td> <Td> May 18, 2009 (2009 - 05 - 18) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 5 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 21, 2009 (2009 - 09 - 21) </Td> <Td> May 24, 2010 (2010 - 05 - 24) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 6 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 20, 2010 (2010 - 09 - 20) </Td> <Td> May 16, 2011 (2011 - 05 - 16) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 7 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 19, 2011 (2011 - 09 - 19) </Td> <Td> May 14, 2012 (2012 - 05 - 14) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 8 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 24, 2012 (2012 - 09 - 24) </Td> <Td> May 13, 2013 (2013 - 05 - 13) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> 9 </Td> <Td_colspan="2"> 24 </Td> <Td_colspan="1"> September 23, 2013 (2013 - 09 - 23) </Td> <Td> March 31, 2014 (2014 - 03 - 31) </Td> </Tr> </Table>

Who is the voice on how i met your mother