"Big Hero Battle" is the first segment of the fifty-fifth episode of Big Hero 6: The Series. It premiered on November 2, 2020 alongside "Go Go the Woweroo", and is the first segment of the sixth episode in the third season.
4 2 Sing, a famous boy band, decides to be crime fighters and challenge Big Hero 6 to a superhero-off.
- Ryan Potter as Hiro Hamada
- Scott Adsit as Baymax
- Génesis Rodríguez as Honey Lemon
- Khary Payton as Wasabi
- Jamie Chung as Go Go Tomago
- Brooks Wheelan as Fred
- Nichkhun as Dae and Hyun-Ki
- Jae Park as Kwang-Sun and Ye Joon
- Jeff Bennett as Baron Von Steamer
- Diedrich Bader as Bluff Dunder
- "We Are 4 2 Sing"
- "Beautiful on the Outside"
- 4 2 Sing is clearly based on K-Pop male groups, such as Monsta X, BTS, and NCT 127. Nichkhun and Jae Park are both from the groups: 2PM and Day6, respectively.
- Initially, Nichkhun and Jae Park's characters were listed as Kei and Aki, and Taka and Yuka, respectively.
- El Fuego, Momakase, Supersonic Sue, Noodle Burger Boy and his family all appear, but without dialogue.