Casting News Updates for Season 10:
Jackson had analyzed the resumes of the cast members including the potential of bringing new & younger ones onto the popular TV Series, so she in a press release announced the following:
1.) "Perry Mason" Season 10, which is set to debut on September 17th, 1966
2.) Raymond Burr, Barbara Hale, William Hopper, William Talman & Richard Anderson all set to reprise their respective roles for Season 10.
3.) Mary Ann Mobley will be on the cast as well, portraying Maxine Reeves, replacing Connie Cezon's Gertie as the receptionist/secretary: likely to get major role later on during the 10th Season if & when Hale exits (as I mentioned earlier in the TL, Della Street takes a job with Gordon Industries).
4.) Anna Navarro, Robert Redford (portraying the role of Bill McKay) joining the cast.
5.) In order to lighten the heavy workload of Burr, there will be several cameo appearances in a couple of the episodes.
6.) William Shatner, Stephanie Powers will be included in some of the episodes, but it wasn't specified what roles their undisclosed characters will be portraying.
7.) Jackson also announced that sometime during the 10th Season & possibly more, it would later be transitioned into a TV Movies Series with 2 HRS, which would allow some of the original cast members to rest up.