"Cobra and Mongoose" is the first segment of the fifty-fourth episode of Big Hero 6: The Series. It premiered on October 26, 2020 alongside "Better Off Fred", and is the first segment of the fifth episode in the third season.
- Ryan Potter as Hiro Hamada
- Scott Adsit as Baymax
- Brooke Wheelan as Fred
- John Michael Higgins as Mini-Max, Game Announcer
- David Shaughnessy as Heathcliff
- Kirby Howell-Baptiste as Cobra
- Zehra Fazal as Basemax
- Some of Heathcliff's personal life is revealed.
- Boss Awesome is shown, but has no speaking lines, most likely due to Stan Lee's passing.
- This is the second episode where Go Go, Honey Lemon and Wasabi are absent, which makes Hiro and Baymax, so far, the only main characters to be present in every episode of the series.