Quote1 I am the sole survivor of my planet. The Last Son of Mars. My name is J'onn J'onzz. Quote2
J'onn J'onzz src

J'onn J'onzz is one of the last living green martians.[9]


He was stranded on Earth. Though he had never done anything wrong, J'onn found himself on the run from the Department of Extranormal Operations and their leader, Hank Henshaw. Henshaw had grown obsessed with capturing every alien he discovered, innocent or guilty. Cornered, J'onn was saved by DEO agent Jeremiah Danvers, who gave his life to stop Henshaw. Jeremiah's dying request was for J'onn to look after his daughters, which J'onn fulfilled by shifting into a double of Henshaw and psychically copying his personality to become the head of the DEO.[10]

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  • Density Control[10]: A secondary effect of shape-shifting is the ability to make his body phase through objects like a ghost.



  • Vulnerability to Fire: Martians are much more vulnerable to fire than the average Earth human. At times this has been portrayed as physical, psychological, or a combination of the two. The effect of this is to strip any Martian of their powers as they involuntarily lose control of their body.
  • This version of the character is exclusive to the continuity of the television series Supergirl, its tie-in comic book series, and its related television series. It is an adaptation of J'onn J'onzz. The original character was created by Joe Samachson and Joe Certa and first appeared in Detective Comics #255.
  • J'onn J'onzz/Hank Henshaw is portrayed by David Harewood. Throughout the series, the character has defaulted to using the appearance of Henshaw. This is due to the story elements of him attempting to blend in and the cost of the CGI used for the character's Martian form.
  • J'onn was born ca. 1699.[9]



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