Disambiguation: Thom Kallor of Xanthu
First published in: 1961
Thom Kallor first appeared as Star Boy in Adventure Comics (DC, 1938 series) #282 (March 1961). He appeared as Sir Prize in Adventure Comics (DC, 1938 series) #350 (November 1966) and #351 (December 1966). Thom first appeared as Starman in Starman (DC, 1994 series) #79 (July 2001) (note: a version of this Starman first appeared in Kingdom Come (DC, 1996 series) #2).
Link: https://en.wikipedia.org/wiki/Thom_Kallor