I Feel Sick is a "doubleshot", full-color comic book written and drawn by the comic artist
Jhonen Vasquez and colored by Rosearik Rikki Simons (who also voiced
GIR in
Invader Zim). It revolves around
Devi D. from
Johnny the Homicidal Maniac (JTHM), and her dealings with the same supernatural and/or psychological forces that drove Johnny to lunacy. Originally intended as a single paperback, it was later split into two issues so as to avoid compromising the length of the story. It was published by
Slave Labor Graphics. Vasquez stated that the creation process of
I Feel Sick was
cathartic. The problems Devi had while working for NERVE and neglecting her own work was reminiscent to the pressure Vasquez had while working on
Invader Zim.