Ultralisk

Trample, Massive
"Let's begin with the hulking monstrosity on the ground. Armed to the teeth (quite litterly) with Kaiser Blades, this guy can sweep a Viking aside like it's a twig in its path. I've seen them kill a score of Marines with a single blow, and charge with such ferocity that they'll even demolish one of those notorious Protoss Force Fields. I'm talking, of course, about the Ultralisk, and now we know everything there i to know about them."
—Radio Liberty