<Tr> <Td> Eric Mendenhall </Td> <Td> Billy </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="4"> </Td> </Tr> <Tr> <Td> Sunkrish Bala </Td> <Td> Dr. Caleb Subramanian </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="4"> </Td> </Tr> <Tr> <Td> Luke Donaldson </Td> <Td> Luke </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="4"> </Td> </Tr> <Tr> <Td> Sherry Richards </Td> <Td> Jeanette </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="4"> </Td> </Tr>

Who are the characters on the walking dead