Mark Zuckerberg, Facebook CEO, in the Oculus Rift virtual-reality headset as Oculus VR CEO Brendan Iribe looks on.

Facebook CEO Mark Zuckerberg will testify in court on Tuesday, January 17 for a potentially explosive lawsuit that claims the Oculus VR startup he acquired for $2 billion was based on stolen technology.

The more than two-year-old suit against Facebook by game maker Zenimax has culminated with a public trial by jury in a Dallas court that began on January 9. Zenimax is seeking $2 billion in damages against Facebook, which is the amount the social networking giant initially paid to buy Oculus in 2014.

Representatives for Zenmiax confirmed to Business Insider that Zuckerberg will take the stand on Tuesday, followed by Oculus cofounder Palmer Luckey later in the week. The trial began on January 9; Oculus CTO and former Zenimax employee John Carmack was the first to testify on January 10.

Facebook tried to argue that Zuckerberg shouldn’t have to answer questions about his acquisition of Oculus, but the case’s judge overruled the request. Luckey’s testimony will be his first public appearance since he admitted to secretly funding a political group