Back in August of 1975, Star Trek fan Rich Portnoy shot almost four minutes worth of 8mm movie film showing original series cast members at a Chicago Star Trek convention.
The 1975 Star Trek convention, attended by over 14,000 people, was held from August 22-24 at the Conrad Hilton Hotel in Chicago.
In attendance were the original series actors, younger and with classic 1970s hairstyles. They included: Leonard Nimoy, William Shatner, DeForest Kelley, Walter Koenig, James Doohan, Nichelle Nichols and George Takei.
Also in attendance was Arlene Martel (T’Pring from Amok time,) wearing a scarf over her dark hair.
The cast was “guarded” by security personnel dressed up as (old style) Klingons. Before Doohan’s entrance, a female Klingon came out with bagpipes.