Sentinels: The Shiva Advent by Van Allen Plexico
Approx. 73,920 words.
Published on March 15, 2010.
The Worldmind has dispatched his top lieutenant, the murderous Vanguard, to Earth--with orders to open the way for ultimate planetary annihilation. Standing in the way: Ultraa, Pulsar, and a motley collection of heroes--and villains--who must overcome their old rivalries and work together, if Earth is to have any chance at all.