By Lynette Rice
Updated October 07, 2010 at 10:30 PM EDT

Scott Caan has become a breakout star by playing Detective Danny “Danno” Williams on Hawaii Five-0 — but the producers haven’t forgotten the memorable actor who first originated the role. Executive Producer Peter Lenkov told EW that it remains a goal to persuade James MacArthur (inset) — aka “Danno” on the series that first aired from 1968 to 1980 — to make a cameo on the CBS drama.

“We’ve been talking to James about being on the show but he just doesn’t know because he’s busy with a business he’s launching,” said Lenkov. “But we’d love to have him.” Lenkov has also set his sights on Al Harrington, who played Det. Ben Kokua on the original series from 1969 to 1975. (Both he and MacArthur are now in their 70s.) “It still feels early in the season,” the producer said. “We have time.” Those are pretty confident words from a guy who has yet to learn whether the drama will receive a back nine order from CBS (the network only picked up 13 episodes of 5-0 before the 2010-11 season began). But it would be a shocker if CBS didn’t go with a full season of Hawaii Five-0, which, at 13.02 million, is currently the most-watched new show.

Speaking of highly anticipated characters, Lenkov also confirmed that Masi Oka (Heroes) will show up in episode four as a coroner named Max Bergman; he’ll appear in at least three episodes this season.