Submission Underground 27 took place Sunday, October 10, 2021 with 10 fights in Portland, Oregon.
| Actor | Role |
|---|---|
 Mason FowlerSelf | Self |
| GGabriel CheccoSelf | Self |
 Cris LencioniSelf | Self |
| ZZack SchneiderSelf | Self |
| AAaron TiegsSelf | Self |
 Micah BrakefieldSelf | Self |
 Kaniela KahuanuiSelf | Self |
| AAdam SmithSelf | Self |
 Travis MooreSelf | Self |
| AAlex LarmeySelf | Self |
| SSean McClearySelf | Self |
| JJuan BernardoSelf | Self |
| AAndrew AlexanderSelf | Self |
| JJames ZengSelf | Self |
| MMark HamelSelf | Self |
| DDaniel WalshSelf | Self |
| PPhelan CarronSelf | Self |
| JJosiah IwamizuSelf | Self |
| JJohn SimonSelf | Self |
| DDaniel GadleySelf | Self |