The Explosive Generation
Originally Posted by Johnnytricks
No, but I'll count that a good guess (since I wasn't even aware of that entry in Shatner's filmography). The scene is from the 1966 horror film
Incubus, noteworthy for being the second feature film to have its script written and performed in the artificial language Esperanto. It was thought lost until 1996, when a French subtitled copy in very poor condition was discovered. SyFy--back when it was still called "The Sci-Fi Channel"--funded the restoration of the film. It's since become something of a cult classic and is available in DVD--if you have a Netflix account that includes DVD borrowing you can get it from there if you're curious.
Following a theme...
Cheers,
bcg