•
Norma Crane made two appearances playing different roles in the episodes:
A Threatened Species and
Crisis. •
Hazel Scott as Dolly Martin in ''If I Can't Sing, I'll Listen'' •
Linda Dangcil also made two appearances playing different roles in the episodes:
A Matter of Priorities and
To Save a Life. •
Mike Farrell as Dr. Vic Wheelwright in the episode
Discovery at Fourteen •
Clu Gulager as Dan Corwin/Matt Smith in the episodes:
End Theme and
A Threatened Species •
Pat Hingle as Dr. Ben Gold and Walsh in the episodes:
Glass Cage and
To Save a Life •
Darby Hinton as Hal Parker in
This Will Really Kill You •
Ron Howard as Cory Merlino, a fourteen-year-old who discovers that his father is homosexual in
Discovery at Fourteen •
Sheila Larken as Liz in the episodes:
A Substitute Womb and ''This Day's Child'' •
Joanne Linville as Anne Sorenson/Joan Stedman in the episodes:
Time Bomb in the Chest and
In Dreams They Run •
Carol Lynley as Judith Walters, the daughter of a business tycoon who is concealing an illness in
Giants Never Kneel •
Ross Martin as Harry Burke, a man who has violent psychotic episodes and the doctors want to perform psycho surgery in
A Purge of Madness •
Tisha Sterling as Casey Woods/Joan in the episodes:
This Will Really Kill You and ''What's the Price of a Pair of Eyes?'' •
Jane Wyman as Dr. Amanda Fallon in the episodes:
Discovery at Fourteen and
And Other Things I May Not See (a backdoor pilot for the series "
Amanda Fallon" that wasn't picked up by NBC) ==References==