The 56-year-old actor said that while he had long "harboured a fantasy" of reviving the cult series, he never thought it would come to fruition, reported Deadline.
"I was surprised. I'd always harboured a fantasy that I might be able to revisit the character in some way - Dale Cooper. I so enjoyed him and... He's just a complex person," MacLachlan said.
"So I was completely surprised when David Lynch said, 'It looks like we're going to return' - and I was very excited for two reasons. One is the character of Dale Cooper, which is a lot of fun, and the world of 'Twin Peaks'.
MacLachlan confirmed that the new season of "Twin Peaks" - expected to span 18 episodes - will begin shooting in the fall, either September or October.