Marty Mantle

Marty Mantle is a recurring character on the third season of The CW's Riverdale. He is portrayed by Matthew Yang King.

He is the father of Reggie Mantle and is an alumnus of Riverdale High School. During his adolescence, he was a member of the Riverdale Bulldogs and The Midnight Club.

Season 3
Marty began playing Gryphons and Gargoyles with Daryl Doiley, Tom Keller, and Hiram Lodge after Daryl found it in the restricted section of the library. After a week of playing, they encounter Alice, FP, Fred, Sierra, Hermione, and Penelope at school after hours also playing. They decide to join forces and play a bigger game.

One day, all ten of them, Marty, Hiram, Daryl, Tom, Alice, FP, Fred, Sierra, Hermione, and Penelope find strange invitations in their lockers to the detention room that night to rise to the challenge and ascend to the next level. That night, the Midnight Club attends the ascension party. They must find the chalices, flip the gryphon coin for their fate and drink from the chalice to meet their destiny. Before starting, to make things more enjoyable, Hiram shares a new drug known as fizzle rocks with everyone.

The festivities begin with an impromptu performance by the Fred Heads, normally just Fred and FP, but Alice, Sierra, and Hermione perform with them as Marty, Hiram, Penelope, Daryl, and Tom party, high off the drugs.

The Midnight Club would later come to learn that Principal Featherhead is missing and that he was at the school the night of the ascension party. The rumors regarding Principal Featherhead’s disappearance spread like wildfire. A week has passed since Featherhead went missing. As it turns out, he was in the school the entire time. Dead and locked in a supply closet. His lips blue.

The Midnight Club gather to discuss Featherhead’s death. Alice informs them that there was blue liquid in the chalices when she found them. Featherhead had blue lips and the police said he had poison in his system. Alice questions what they did to him though they deny any wrongdoing. And this begins the endless blame game between all members of the Midnight Club. Alice dismisses any notions of wrongdoing. When Penelope exclaims that they’re not going to the cops, Alice accuses her of poisoning the chalices when she set up the game, however, it wasn’t Penelope or Daryl. Alice recalls the chalices just sitting there, meaning whoever invited them to the party was trying to kill one or more of them. Sierra wants to destroy the game so that it can’t be traced back to them. FP suggests destroying the manuals and scattering everything else. The Midnight Club then spits on their hands and make a pact to never speak of Gryphons and Gargoyles ever again.

After getting rid of G&G, they return to their normal lives and go their separate ways. Burdened by their guilt, they all become different people.