Little Could Thayer David Have Known...

[Mysterious Benefactor]

...in 1966 -

1966: Ep #70 - Matthew and Liz discuss his attack on
Burke.

- that in four years in the future he would be acting in Ben Stokes' old age makeup -

1970: Ep #1113 - Barnabas vows that he will no longer
condemn himself to his coffin.

- especially considering that in 1966 the Ben Stokes character hadn't even been created yet.