  This White Pape motivates the time domain extragalactic science case for the
NASA Near-Earth Object Camera (NEOCam). NEOCam is a NASA Planetary mission
whose goal is to discover and characterize asteroids and comets, to assess the
hazard to Earth from near-Earth objects, and to study the origin, evolution,
and fate of asteroids and comets. NEOCam will, however, cover 68% of the
extragalactic sky and as the NEOWISE-R mission has recently proved, infrared
information is now vital for identifying and characterizing the $\gtrsim$10
million IR bright Active Galactic Nuclei, as well as using the IR light curve
to provide deep insights into accretion disk astrophysics. NEOWISE-R data has
also been used to discover Super-luminous Supernovae, dust echos in Tidal
Disruption Events and detects all of the known $z\geq7$ quasars (and over 80%
of the known $z\geq6.70$ quasars). As such, for relatively little additional
cost, adding the capacity for additional NEOCam data processing (and/or
alerting) would have a massive scientific and legacy impact on extragalactic
time domain science.
