  We present spectral and timing analysis of all the data collected by the
Extreme Ultraviolet Explorer for the BL Lac object Mrk 421 from 1994 to 1997.
During these years Mrk 421 has been observed by EUVE 4 times with the
DS/Spectrograph and 2 times with the imaging telescopes for a total of ~1.4
millions seconds. The total EUVE light curve seems to be smoothly varying on
the long time-scale while on a shorter time-scale there is evidence of an EUVE
flare correlated to the 1995 TeV flare. We analysed the three spectral data set
in an homogenous way using the proper off-axis calibrations and checked for the
existence of absorption features around ~70 A (Kartje et al.,97,ApJ,474,630).
We also show the first power spectrum analysis of the Mrk 421 EUVE lightcurves
and a comparison with the predictions by theoretical models (e.g. Celotti et
al.,1991,ApJ,377,403).
