Actor Seth Green is not a fan of Ben Affleck's upcoming role as Batman, insisting the A-lister is not "scary" enough to play the legendary Caped Crusader.

The former Buffy the Vampire Slayer star is a well-known comic book enthusiast who even penned his own graphic novel in 2005, and now he's adding to the list of Batman purists who are critical of the Argo director's latest gig.

During an interview with veteran newsman Larry King, Green insisted that Affleck going head-to-head with Henry Cavill's Man of Steel in the upcoming Batman Vs. Superman film will not be convincing in the least.

The comic book aficionado explains, "You've got to remember that at the core of that character, Batman's a crazy person. Batman has no powers. Batman is a rich, screwed-up kid whose parents were killed in front of him, who with his money and insanity decided to become a vigilante symbol to combat darkness.

"If this movie is meant to be the idealistic alien, humans-before-all-else Superman, and this is supposed to be the grizzled, weathered Batman who's been living in Gotham, fighting crime himself for 10 years, you need a guy who's older. You need a guy who's got more weight. And you need a guy that a Henry Cavill Superman is gonna be actually scared of."

When King noted that Affleck should be praised for his acting abilities, Green replied, "Yes, but there is only so much you can act a role before people are or are not going to believe you in that role."