In order to bring the Pantheon to Earth and kick off his plans for conquest, Old Hob has been working with Krang to repair a damaged interdimensional portal. Instead of opening the gateway to the dimension that the Pantheon is stranded in, their efforts cause a wibble wobble in the space-time continuum, something that not only returns to Krang one of the evil Utroms' most prized possessions, but also delivers three evil Nega-Turtles to New York City. (I guess we all know who the Heroes in a Half Shell will be facing off against this month!)