On the Star Trek TOS episode Assignment: Earth (1968), in which he plays a human raised on a distant planet and sent to Earth as a troubleshooter, was written as the springboard for a spin-off series. The new series was to feature more adventures of Gary Seven (Lansing) and Roberta Lincoln (Teri Garr), but it never came about.
[on the perils of being typecast] People don't want to mess with success. If you do one thing well, then that's all they want you to do. Very often if you're not careful it just gets narrower and narrower.
