However, in general, heroes may fight with an alien foe in order to protect their world or society from a perceived threat. The alien foe may be invading their planet or attempting to take over their civilization, and the heroes may feel a sense of duty or responsibility to defend their home and people. Additionally, heroes may fight with an alien foe in order to prevent the alien foe from causing harm or destruction to other planets or civilizations. In some cases, heroes may also fight with an alien foe as a way of upholding their personal values or beliefs. Ultimately, the reasons why heroes fight with an alien foe can vary widely depending on the specific circumstances of the situation.