The actors’ union that began striking against video game companies last summer has filed an unfair labor practice charge against Epic Games, the creator of Fortnite.

The recent controversy over the use of the voice of the late James Earl Jones to interact with Darth Vader in Fortnite has opened a new controversy.

Hollywood’s actors’ union filed an unfair labor practice charge against Llama Productions on Monday, alleging the company replaced actors’ work by using artificial intelligence to generate Darth Vader’s voice in Fortnite without notice.