KOTC: Underground 55 was an event held on April 30, 2010, at the Jackpot Junction Casino Hotel in Morton, Minnesota. The main event was Garrett Olson vs. Jeremy Lang.
| Actor | Role |
|---|---|
| GGarrett OlsonSelf | Self |
| JJeremy LangSelf | Self |
| JJosh JanousekSelf | Self |
| JJustin GrizzardSelf | Self |
| KKent NatheSelf | Self |
| NNate WilliamsSelf | Self |
| BBobby FerrierSelf | Self |
| KKyle FletcherSelf | Self |
| SSam SchadSelf | Self |
| BBeau PenkSelf | Self |
| MMike ZimmerSelf | Self |
| JJared AverbeckSelf | Self |
| JJarrod L'HeureuxSelf | Self |
| NNick HubenetteSelf | Self |
| FFernando ViolanteSelf | Self |
| TTyler ReedSelf | Self |
| JJason ZimmerSelf | Self |
| TTony HounSelf | Self |
| JJoel WalesSelf | Self |
| CCharles KelmSelf | Self |
| BBrad PadgettSelf | Self |
| JJosh SchmidtSelf | Self |
| KKyle WoodSelf | Self |
| BBrett HodgenSelf | Self |
| TTodd BrooksSelf | Self |
| ZZach KellsoSelf | Self |