|"What do you call it again? Rylo? Ruby?"
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Griffin Turner's Grandfather is the unnamed former Elemental Master of Speed mentioned in the first episode of Season 4: The Tournament of Elements. He was never depicted in the show, but was only mentioned by Garmadon that Griffin Turner is his grandson.
Not much is known about him except for the fact that he must have known Garmadon some time before his transformation to evil.