A male gargoyle (though one artificially created) and a villain of the tv series.

Under orders from David Xanatos, Doctor Anton Sevarius created Thailog through the gargoyle goliath's through blood samples extracted from him. As Thailog grew, Xanatos educated him, giving Thailog skills in business and a cunning mind. But disliking being a pawn in Xanatos' schemes, he concocted a plan to kill Xanatos, Sevarius and Goliath (since he wanted to know what his "father" was like). He had hoped to share power with Goliath, but after finding out how both he and Goliath were completely opposite of each others personality, he decided to eliminate him too. Though the plan failed, Thailog managed to escape and became an occasional threat in later episodes.

Trivia:

• He, like his gene father, was also voiced by Keith David.