A new villain calling himself Major Blast appears in the city and targets Fred; the other members of Big Hero 6 try to figure out who is behind the Major Blast mask.
| Name | Type | Role | |
|---|---|---|---|
| Jenny Jaffe | Writer | ||
| John Michael Higgins | Guest Star | ||
| Susan Sullivan | Guest Star | ||
| John DiMaggio | Guest Star | ||
| Zehra Fazal | Guest Star | ||
| Trey Buongiorno | Director |