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We present the Kepler light curve of KIC 4552982, the first ZZ Ceti(hydrogen-atmosphere pulsating white dwarf star) discovered in the Kepler fieldof view. Our data span more than 1.5 years with a 86% duty cycle, making it thelongest pseudo-continuous light curve ever recorded for a ZZ Ceti. Thisextensive data set provides the most complete coverage to-date of amplitude andfrequency variations in a cool ZZ Ceti. We detect 20 independent frequencies ofvariability in the data that we compare with asteroseismic models todemonstrate that this star has a mass M$_*$ > 0.6 M$_{\rm Sun}$. We identify arotationally split pulsation mode and derive a probable rotation period forthis star of 17.47 $\pm$ 0.04 hr. In addition to pulsation signatures, theKepler light curve exhibits sporadic, energetic outbursts that increase thestar's relative flux by 2-17%, last 4-25 hours, and recur on an averagetimescale of 2.7 days. These are the first detections of a new dynamic whitedwarf phenomenon that we believe may be related to the pulsations of thisrelatively cool (T$_{\rm eff}$ = 10,860 $\pm$ 120 K) ZZ Ceti star near the rededge of the instability strip.

KIC 4552982: Outbursts and Asteroseismology from the Longest Pseudo-Continuous Light Curve of a ZZ Ceti