Submission Underground 12 took place Sunday, March 29, 2020 with 9 fights in Portland, Oregon.
| Actor | Role |
|---|---|
 Craig JonesSelf | Self |
 Kevin CaseySelf | Self |
| BBen EgliSelf | Self |
 Jake EllenbergerSelf | Self |
| JJuan BernardoSelf | Self |
| BBobby EmmonsSelf | Self |
 Cris LencioniSelf | Self |
| LLogan SkinnerSelf | Self |
| MMatt StringhamSelf | Self |
| JJoe LevasseurSelf | Self |
| AAlex LarmeySelf | Self |
| TThomas PatrickSelf | Self |
 Jake SmithSelf | Self |
| GGorge MartinezSelf | Self |
 Don StonerSelf | Self |
| LLee FloresSelf | Self |
| CCody KenagaSelf | Self |
| JJohn SimonSelf | Self |