A Different Dynamic Duo
While the series was still in production, the casting agents searched far and wide to find the perfect dynamic duo. So two separate screen tests were carried out. The first included Adam West and Burt Ward, and the second included Lyle Waggoner and Peter Deyell.
Source: fandom.com
After the screenings, eventually Adam West and Burt Ward landed the part. You can still find both screen tests on YouTube, and they show just how different the series would have been if the other duo had landed the job. Thankfully for Waggoner, he went on to star alongside Lynda Carter in Wonder woman in the 70s.