Disambiguation: Doom Patrol villain
First published in: 1968
Captain Zahl first appeared in The Doom Patrol (DC, 1964 series) #121 (September-October 1968). He returned as General Zahl in The New Teen Titans (DC, 1980 series) #13 (November 1981). He died in issue #15 (January 1982).
Link: https://en.wikipedia.org/wiki/General_Zahl