Spinejackal is a Category IV Kaiju.
Spinejackal was a tall, gray-skinned Kaiju with bioluminescent traces emitting from its mouth and eyes. On the back of its head and back were multiple barbed protrusions running down toward its tail. It possesses a jaw with mandibles and walked upright. It possessed panoramic vision from the abundance of eyes around the head enabling it to see front, sides, and back all at once.
Spinejackal emerges from the Breach and attacks the Sydney Opera House in Sydney, Australia. Mark-3 and Mark-5 Jaegers Vulcan Specter, and Striker Eureka are deployed against the Kaiju. Spinejackal, proves difficult to master.
It preemptively thwarts the attacks of Vulcan when it attempts to herd it away from the city. It avoids Striker Eureka's Anti-Kaiju missile barrage attack. Eventually Vulcan Specter pushes far enough away from the city that Striker Eureka is able to use a nearby windmill to cut the top of its head off.