Ted Cassidy left a memorable mark on Star Trek primarily through his imposing physical presence and deep voice, which suited the eerie android Ruk in "What Are Little Girls Made Of?" His work also intersects with iconic episodes like "The Corbomite Maneuver" and "Arena," although he is most closely linked to his distinctive performances in original series episodes. While Cassidy is widely remembered outside Star Trek for playing Lurch in The Addams Family, Star Trek fans appreciate his ability to bring an unsettling gravitas to guest roles, enhancing stories led by Captain Kirk and the Enterprise crew. His portrayal of characters with a mysterious, almost otherworldly aura contributed to the dynamic storytelling of Gene Roddenberry's original vision and remains a fascinating part of Star Trek’s rich character tapestry.