The battle between Facebook and Oculus is ongoing but John Carmack has now sued ZeniMax for 22.5 million which he claims they owe from when they purchased id Software in 2009.

According to Dallas News, the case was filed on Tuesday which claims that ZeniMax has refused to pay Carmack the final installment they owe or allow him to convert it into shares. Carmack had received a “convertible promissory note valued at more than $45.1 million”, half of which he converted into ZeniMax shares.

Carmack is asking the court to compel ZeniMax to pay Carmack the outstanding sum from the sale. ZemiMax told Dallas News that the claim was “completely without merit” and added, “Apparently lacking in remorse, and disregarding the evidence of his many faithless acts and violations of law, Mr. Carmack has decided to try again.”

The Carmack/ZeniMax relationship has not gone well.