<Tr> <Th> 20 </Th> <Td> </Td> <Td> "Seed" </Td> <Td> Ernest Dickerson </Td> <Td> Glen Mazzara </Td> <Td> October 14, 2012 (2012 - 10 - 14) </Td> <Td> 10.87 </Td> </Tr> <Tr> <Th> 21 </Th> <Td> </Td> <Td> "Sick" </Td> <Td> Billy Gierhart </Td> <Td> Nichole Beattie </Td> <Td> October 21, 2012 (2012 - 10 - 21) </Td> <Td> 9.55 </Td> </Tr> <Tr> <Th> 22 </Th> <Td> </Td> <Td> "Walk with Me" </Td> <Td> Guy Ferland </Td> <Td> Evan Reilly </Td> <Td> October 28, 2012 (2012 - 10 - 28) </Td> <Td> 10.51 </Td> </Tr> <Tr> <Th> 23 </Th> <Td> </Td> <Td> "Killer Within" </Td> <Td> Guy Ferland </Td> <Td> Sang Kyu Kim </Td> <Td> November 4, 2012 (2012 - 11 - 04) </Td> <Td> 9.27 </Td> </Tr>

Name of last night's walking dead episode