I really wasn't even aware that Batman and Superman had this kind of grudging friendship.

Mark Valley's quote reflects his surprise and unawareness about the complex and often grudging friendship between two of the most iconic superheroes, Batman and Superman. Valley is expressing a personal revelation about the dynamic between these two characters, which, despite their differences, develop a relationship based on mutual respect, even if it's sometimes reluctant. The quote highlights that the nature of their friendship isn't one of immediate harmony, but one that evolves over time, filled with tension and competition.

This quote may come from Valley’s experience portraying a character in a world where superheroes and their relationships are central themes. The friendship between Batman and Superman is famously complicated in comic lore, as the two heroes often clash due to their contrasting personalities, ideologies, and approaches to justice. Valley's comment may reflect how the nuances of their relationship were not immediately apparent to him, perhaps until he delved deeper into the storylines or the broader superhero universe.

The origin of this realization could stem from Valley's involvement in projects that explore superhero narratives, such as his work in the television series Human Target. As an actor, he may not have been fully aware of the intricacies of these characters before taking on roles that required him to engage with such content. The quote shows his genuine curiosity about the dynamics of fictional relationships, especially those as complex as the one between Batman and Superman.