'The Dark Knight' star Aaron Eckhart talks to ET about all-things Batman, including how he was obsessed with the caped crusader as a kid -- right down to owning the bed sheets!

Meanwhile, Eckhart calls 'The Dark Knight' a "part of history," saying there is a "vibrancy about Batman" and that he's "happy to be along for the ride."

'The Dark Knight' flies into theaters on Friday.