A former longtime Mattel HQ Inc. worker is asking a judge to vacate an arbitrator’s dismissal of all of the plaintiff’s claims in which he alleged that his job duties were gradually given to new employees who were younger and paid less before he was wrongfully fired in 2022 because of his age.

On Thursday, attorneys for plaintiff Jose Arellano filed court papers with Los Angeles Superior Court Judge Stephen P. Pfahler in response to Mattel’s petition to confirm the findings of the arbitrator, retired Judge Katherine Chilton. According to Arellano’s lawyers, Chilton refused to hear material evidence, exceeded her authority on factual issues and substantially prejudiced the plaintiff’s rights by denying certain discovery and excluding critical witness testimony.

“These errors require (vaca

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