Wikipedia
Grimlock is the name of several fictional robot characters in the Transformers franchise. He is usually portrayed as the immensely strong, power-mongering leader of the Dinobots, a small subfaction of Autobots that transform into dinosaurs. In 2007, USA Today polled people as to which Transformer they want to appear in the second installment in the Transformers film series; Grimlock came in tied for second with Devastator.
Grimlock is a fictional monstrous humanoid that lives in the Underdark, a vast interconnected system of caves underneath various Dungeons & Dragons campaign settings. Based on subterranean humanoids called " morlocks" created by H.G. Wells for his 1895 novel The Time Machine, the grimlock was first adapted for Advanced Dungeons & Dragons (AD&D), and has appeared in each subsequent version of D&D rules as a savage, pale-skinned and eyeless humanoid that dwells in dark places and prefers the taste of human flesh.