Slimer will be returning in upcoming Ghostbusters reboot

"I'm not going to lie, working with Melissa (McCarthy), and Kristen (Wiig), and Kate (McKinnon) was really dope. But I got to work with Slimer, dude. Like Slimer!!! I'm in a scene with Slimer! I'm a huge Ghostbusters fan and it was a dream come true."

“I play the FBI agent who works for the mayor,” revealed Williams when he popped into the Entertainment Weekly Radio studios on Thursday. “Our whole thing is, we’re going to tell the people it was a flash in the sky and ‘Run along little women with your ghosts, we got this.’ That was a dream job. They’re at the top of their game, man. I had the pleasure of working with Kristen Wiig and Kate McKinnon on a show on IFC called Spoils Before Dying. So, I had a relationship with them already. Leslie Jones, you meet her once, you feel you’ve known her your whole life. She penetrates any walls or any barriers you may have, she goes right through that, right to your heart chakra. And Melissa, she’s just a gem. I have so much respect for these ladies.”