Learn Spanish (Latin America): El escuadrón del villano tiene un superpoder peligroso. - The villain's squad has a dangerous superpower.

Even though an escuadrón (squad) is made up of multiple people, it is a singular collective noun. Unlike in some dialects of English where you might say 'the squad have,' Spanish strictly requires a singular verb for collective nouns like escuadrón, equipo (team), and grupo (group).

Is superpoder always written as one attached word in Spanish?

Yes! In Spanish, the prefix super- is written attached to the noun it modifies without a space or hyphen, yielding words like superpoder and superhéroe. It also keeps the gender of the original root word, which is why it is masculine here: un superpoder (from el poder).

Could I use enemigo or malo instead of villano here?

You could, but villano specifically means 'villain' in the context of a fictional story, comic book, or movie. This fits perfectly with the theme of a superpoder (superpower), whereas enemigo (enemy) or el malo (the bad guy) are more general.