https://www.metv.com/stories/robert-wagner-explained-why-fans-had-to-wait-so-long-for-a-hart-to-hart-reunion

"We’ve tried so many times to do it," said series star Robert Wagner.

Robert Wagner trusted his Hart to Hart co-star Stefanie Powers to defend him against any bad guys (https://www.metv.com/stories/robert-wagner-trusted-his-co-star-to-defend-him-against-any-bad-guys)

Powers was more than willing to fight for her on-screen husband.