As Marshall, Gilbert and Amy are preparing for her father’s Spooktacular Halloween-themed wedding to his fiancé Carl, plans go awry when they discover that their mummy friend Harold and his beloved Rose may be in danger.
| Actor | Role |
|---|---|
 Malachi BartonMarshall | Marshall |
 Christian J. SimonGilbert | Gilbert |
 Sophia HammonsAmy | Amy |
 Phil WrightHarold | Harold |
 Melanie BrookBuzzy | Buzzy |
 T.J. StormNot listed | Not listed |
 Rryla McIntoshNot listed | Not listed |
| JJordan ConleyNot listed | Not listed |
 Adam WylieNot listed | Not listed |
 Claude KnowltonPop | Pop |
 Antonio CayonneCarl | Carl |