Here's Geoffrey Scott from S02 E11,
Hear No Evil:
He just had the one scene in which he tells Cannon there's a call for him on the house phone.
And here's John Lasell from S02 E09,
Child of Fear:
And a bonus with Julia Adams, who I always enjoyed back in the day, so I probably would have saved the ep to watch just for her:
He had several scenes. And he looks a bit worse for wear because he was a kidnap victim throughout most of the ep.
(And a bit of trivia when it comes to Julie Adams: 1971/1972 must have been her time to share scenes with former DS stars because not only did she appear with John Lasell in this
Cannon, but she also appeared with Kate Jackson on
The Jimmy Stewart Show...)