Dark Knight star Christian Bale recalls his costar Heath Ledger as “intense” and “anarchistic” on the set of the late actor’s last movie, people.com reports.

“He was incredibly intense in his performance, but incredibly mellow and laid-back. Certainly there was this great anarchistic streak to it — just getting dirtier than anybody’s envisioned the Joker before,” Bale, 34, tells Details magazine.

Ledger died on Jan. 22 of a prescription-drug overdose at the age of 28. Bale laments the film “was something I wanted to share with him – and expected to do so.

“And I can’t do anything else but hope that it will be an absolutely appropriate celebration of his work,” he says. In earlier interviews, Bale commended Ledger on doing “one hell of a job.”

Bale adds he almost never donned the Batsuit at all because of a deep-seated fear in closed spaces. “[I was] just thinking, ‘This isn’t going to work. I’m claustrophobic, I can’t breathe, I’m getting a headache already, and this is all going to go very badly,’” he says.

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