Affleck started building Batcave
A 2013 reboot of the classic superhero film series, Man of Steel will star British heartthrob Henry Cavill as Clark Kent while Amy Adams portrays Lois Lane. Kevin Costner and Diane Lane are also on board to star as Clark's parents, Jonathan and Martha Kent, respectively.
Ben Affleck once started to build a Batcave in his house.
The star - who was announced last week as the latest actor to portray the iconic superhero - was so obsessed with the character he built a replica of the entrance to the secret lair where Bruce Wayne keeps his alter ego's suit, weapon and vehicles.
Director Kevin Smith - a close friend of Affleck's who has worked with him on several movies - said: ''When I first saw [his house] he was touring me through the place and said, 'Come here, I gotta show you my room'.
''He brings me into the room and goes, 'Look at this'. There's an office room and this beautiful bookcase - he reached under and he clicked something and all of a sudden the bookcase opened.
''I was like, 'No! You built a f***ing Batcave?' And he was like, 'No I built a Batcave entrance!' When you went in behind the bookcase it was a panic room.''
Affleck has been a controversial choice to play Batman - set to make his debut in the sequel to 'Man of Steel' alongside Superman - but Smith, who has previously written Batman comics for DC, is certain he will do the character justice.
Speaking on the Hollywood Babble-On podcast, he added: ''This dude has loved Batman going as far back as I can remember.
''He's always been into the notion. He'll honour the character. I honestly think the dude's a great actor, it makes absolute sense.
''This dude has been to the bottom, then he clawed his way back to respectability ... For him, I think he thinks it's a good move.''