Bob was annoyed at how little his army of zombies was doing. It was a zombie apocalypse, it aught to be a situation filled with fear and strife, a survival of the fittest. However instead his army of the dead was getting stomped like roadkill, wiped out by the dozens. No matter how many he created, they were simply destroyed by the many superhuman beings flying around. Furthermore, the transformers who had just arrived were about to be wiped out by the two superheroes that had arrived. Surely that couldn't be called a fair fight. As such, Bob decided it was only fair that he distract one of the brave supers, so that the remaining one could work with the Teen Titans to face the Combaticons. A much more fair strategy by far, as the Combaticons couldn't hope to survive the onslaught of one such as Captain Marvel.
From the gem in the centre of the forest rose an undead far more powerful than the rest. It had a mortal form, and yet contained a shard of Bob himself. It's eyes glowed with power, as the small shard of pure evil ignited it. Bob was a being of many aspects, and this shard belonged to the darkness within him. The being floated into the air, focusing on the target it's master had selected, both hands encased in an aura of frost. It then shoots forward, breaking the sound barrier as it smashes into Captain Marvel, smashing him through the forest with a single punch. It then makes use of the element of surprise by continuing it's melee assault.