"The summit dinner was a smashing success. Now, to launch my new pop duo, Hellboyz," Oswalt tweeted, alongside a photo of him holding a wineglass, while he sits between Perlman and Harbour in a restaurant.
Perlman shared the picture on his Instagram account.
"Not since Bill Clinton, Menachem Begin, and Anwar Sadat has there been such an epic summit yelding such a little result! Apparently Patton Oswalt aka balvenieboy thought it was a good idea to host @DavidKHarbour and yours truly for a detente dinner. The result: i gained 3 pounds and ruined my liver. Meanwhile, good luck kid! Signed, the babe," Perlman captioned the image.
Perlman and filmmaker Guillermo del Toro announced in February they would not return for a third film in their live-action Hellboy franchise.
Based on graphic novels by writer-artist Mike Mignola and featuring Ron Perlman as the titular demon, Hellboy was released in 2004 and its sequel Hellboy II: The Golden Army hit theaters in 2008. The movies also starred Doug Jones, Selma Blair and the late John Hurt. The cast members reprised their roles vocally in two direct-to-video, animated movies, as well.
Mignola said last month there would be a third, live-action movie, but Stranger Things star Harbour will take over the lead role under the direction of Neil Marshall.