<Table> <Tr> <Th_colspan="2"> "The Greatest Hero of Them All" </Th> </Tr> <Tr> <Th> Publisher </Th> <Td> DC Comics </Td> </Tr> <Tr> <Th> Publication date </Th> <Td> August--September 1987 </Td> </Tr> <Tr> <Th> Genre </Th> <Td> <Ul> <Li> Science fiction, superhero </Li> </Ul> </Td> </Tr> <Tr> <Th> Title (s) </Th> <Td> Legion of Super-Heroes vol. 3, #37--38 Superman vol. 2, #8 Action Comics #591 </Td> </Tr> <Tr> <Th> Main character (s) </Th> <Td> Legion of Super-Heroes Superboy (Kal - El) Superman Time Trapper </Td> </Tr> <Tr> <Th_colspan="2"> Creative team </Th> </Tr> <Tr> <Th> Writer (s) </Th> <Td> Paul Levitz John Byrne </Td> </Tr> <Tr> <Th> Penciller (s) </Th> <Td> John Byrne Greg LaRocque Mike DeCarlo </Td> </Tr> </Table> <Tr> <Th_colspan="2"> "The Greatest Hero of Them All" </Th> </Tr> <Tr> <Th> Publisher </Th> <Td> DC Comics </Td> </Tr>

Who was the greatest hero of all time