5. Ted Cassidy
Blink and you’ll miss Ted Cassidy’s cameo in the season 2 episode of Batman titled “The Penguin’s Nest.” While climbing up the side of a building with their Batropes, the Caped Crusader (West) and Robin (Ward) disturb Lurch from The Addams Family. Cassidy reprises his most famous role by opening up a large window, so he can briefly converse with the Dynamic Duo.
Lurch claims to have been startled by Batman and the Boy Wonder, in what was one of the show's many famous window cameos, to which West’s costumed crimefighter replies, “Yes, citizen, you may return to your harpsichord.”
Meanwhile, Cassidy is best known by Trekkies for playing Ruk in the The Original Series season 1 episode, “What Are Little Girls Made Of?” However, Cassidy worked on multiple installments of TOS, including “The Corbomite Maneuver,” as the terrifying voice of Balok’s fearsome-looking façade. Plus, Cassidy provided the voice for the Gorn in “Arena,” but the actor’s distinct voice is slightly disguised as the creature taunts Captain Kirk throughout their one-on-one conflict.