The phrase "biggest superhero" refers to the superhero who is considered the most powerful, influential, or popular among all superheroes. Full definition
Josh Brolin has played iconic characters in the two biggest superhero movies of the Summer - Avengers: Infinity War's Thanos and Deadpool 2's Cable - but which is better? (screenrant.com)
Avengers Infinity War is Marvel's biggest superhero film. (indianexpress.com)
Now, fans have turned their attention instead to the other big superhero franchise in town, the -LSB-...] (flickeringmyth.com)