Matthew Lillard wants to reunite with filmmaker James Gunn, who is also the head of DC Studios. Lillard and Gunn worked together on 2002's Scooby-Doo and its sequel Scooby-Doo 2: Monsters Unleashed, both films where the latter worked as a writer. However, going forward, Lillard wishes to be part of Gunn's DC Universe. At a recent Los Angeles Comic-Con conversation, he said, "I have wanted to be in a superhero world. I have wanted to be in the DCU, if anyone’s curious. If you run into James Gunn, tell him I am available."

Lillard also discussed his experience collaborating with Gunn in the past. Describing Gunn as one of his "dear friends," the actor said that he is looking forward to the filmmaker to invite him to the universe. "I do not know if it (the invitation) is lost in the email," Lillard quipped.

In a previous X post, Gunn expressed his desire to expand DC Universe with new cast members. “We have hundreds of roles to cast. As I have always done, some will be brand new faces, some will be actors I have worked with before, and some will be actors you know who I have never worked with. What matters most is the actor fits the role and they are easy to work with," he wrote.