Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Morbius | 2022 | |
| Writer | Ghost Rider - Koston Henki | 2012 | |
| Writer | Conan Hävittäjä | 1984 | |
| Writer | Tulen ja jään maa | 1983 | |
| Writer | Red Sonja | 1985 | |
| Actor | Marvel's Captain America: 75 Heroic Years | 2016 | Himself |
| Actor | Batman & Bill | 2017 | Himself |
| Actor | Batman and Me: A Devotion to Destiny, the Bob Kane Story | 2008 | Roy Thomas |
| Writer | Red Sonja | 2025 |