  We present UV images and spectra of the starburst galaxy I Zw 18, taken with
the Space Telescope Imaging Spectrograph. The high spatial resolution of these
data allows us to isolate clusters containing Wolf-Rayet stars of the subtype
WC. Our far-UV spectra clearly show CIV 1548,1551 and HeII 1640 emission of WC
stars in two clusters: one within the bright (NW) half of I Zw 18, and one on
the outskirts of this region. The latter spectrum is unusual, because the CIV
is seen only in emission, indicating a spectrum dominated by WC stars. These
data also demonstrate that the HI column in I Zw 18 is strongly peaked in the
fainter (SE) half of I Zw 18, with a column depth far larger than that reported
in previous analyses.
