<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> NCIS is an American police procedural television series, revolving around a fictional team of special agents from the Naval Criminal Investigative Service, which investigates crimes involving the U.S. Navy and Marine Corps . The series was created by Donald P. Bellisario and Don McGill as a backdoor pilot with the season eight episodes "Ice Queen" and "Meltdown" of JAG . The series premiered on September 23, 2003 featuring an ensemble cast which has included Mark Harmon, Sasha Alexander, Michael Weatherly, Pauley Perrette, David McCallum, Sean Murray, Cote de Pablo, Lauren Holly, Rocky Carroll, Brian Dietzen, Emily Wickersham, Wilmer Valderrama, Jennifer Esposito, Duane Henry, and Maria Bello . </P> <Table> <Tr> <Th> Actor </Th> <Th> Character </Th> <Th_colspan="15"> Season </Th> </Tr> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> 5 </Th> <Th> 6 </Th> <Th> 7 </Th> <Th> 8 </Th> <Th> 9 </Th> <Th> 10 </Th> <Th> 11 </Th> <Th> 12 </Th> <Th> 13 </Th> <Th> 14 </Th> <Th> 15 </Th> </Tr> <Tr> <Td> Mark Harmon </Td> <Td> Leroy Jethro Gibbs </Td> <Td_colspan="15"> Main </Td> </Tr> <Tr> <Td> Sasha Alexander </Td> <Td> Caitlin "Kate" Todd </Td> <Td_colspan="2"> Main </Td> <Td> Guest </Td> <Td_colspan="4"> </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="2"> </Td> <Td> Guest </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Michael Weatherly </Td> <Td> Anthony "Tony" DiNozzo </Td> <Td_colspan="13"> Main </Td> <Td_colspan="2"> </Td> </Tr> <Tr> <Td> Pauley Perrette </Td> <Td> Abby Sciuto </Td> <Td_colspan="15"> Main </Td> </Tr> <Tr> <Td> David McCallum </Td> <Td> Donald "Ducky" Mallard </Td> <Td_colspan="15"> Main </Td> </Tr> <Tr> <Td> Sean Murray </Td> <Td> Timothy "Tim" McGee </Td> <Td> Recurring </Td> <Td_colspan="14"> Main </Td> </Tr> <Tr> <Td> Cote de Pablo </Td> <Td> Ziva David </Td> <Td_colspan="2"> </Td> <Td_colspan="9"> Main </Td> <Td_colspan="4"> </Td> </Tr> <Tr> <Td> Lauren Holly </Td> <Td> Jenny Shepard </Td> <Td_colspan="2"> </Td> <Td_colspan="3"> Main </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> </Td> <Td> Guest </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Rocky Carroll </Td> <Td> Leon Vance </Td> <Td_colspan="4"> </Td> <Td> Recurring </Td> <Td_colspan="10"> Main </Td> </Tr> <Tr> <Td> Brian Dietzen </Td> <Td> Jimmy Palmer </Td> <Td_colspan="9"> Guest </Td> <Td_colspan="6"> Main </Td> </Tr> <Tr> <Td> Emily Wickersham </Td> <Td> Eleanor "Ellie" Bishop </Td> <Td_colspan="10"> </Td> <Td_colspan="5"> Main </Td> </Tr> <Tr> <Td> Wilmer Valderrama </Td> <Td> Nicholas "Nick" Torres </Td> <Td_colspan="13"> </Td> <Td_colspan="2"> Main </Td> </Tr> <Tr> <Td> Jennifer Esposito </Td> <Td> Alexandra Quinn </Td> <Td_colspan="13"> </Td> <Td_colspan="1"> Main </Td> <Td_colspan="1"> </Td> </Tr> <Tr> <Td> Duane Henry </Td> <Td> Clayton Reeves </Td> <Td_colspan="12"> </Td> <Td> Guest </Td> <Td_colspan="2"> Main </Td> </Tr> <Tr> <Td> Maria Bello </Td> <Td> Jacqueline Sloane </Td> <Td_colspan="14"> </Td> <Td_colspan="1"> Main </Td> </Tr> </Table> <Tr> <Th> Actor </Th> <Th> Character </Th> <Th_colspan="15"> Season </Th> </Tr>

What is ducky's first name on ncis