The Flintstones and Rubbles win a trip on "Make a Deal or Don't" to Count Rockula's castle in Rocksylvania where they have an unpleasant meeting with the Count and his servant Frankenstone.
Willie Gilbert (story)
Gay Autterson, Mel Blanc, Ted Cassidy
When Fred wins the big prize on the "Make A Deal or Don't" game show, he and Wilma plan a vacation with Barney and Betty to Count Rockula's spooky castle in Rocksylvania which has now been turned into a tourist resort. Unfortunately, during the trip, Fred and Barney accidentally stumble across Rockula's old laboratory, where his unfinished Frankenstone monster sleeps, and forget to close the window when they leave the lab. Lightning subsequently strikes the machines in the lab, and provide Frankenstone with life. Frankenstone awakens Count Rockula (who has been asleep for the past five hundred years, thus explaining his disappearance) from his secret crypt, and the two scare everyone out of the hotel, except for the Flintstones and the Rubbles, who had gone to bed early due to jet lag.
Rockula and Frankenstone eventually discover the Flintstones and Rubbles, and Rockula mistakes Wilma for his long-lost bride and vows to make her his, even if it means killing Fred. On a comedic note, Wilma mistakes Rockula for the hotel manager, Mr. Silika, who had dressed up as Rockula, for quite some time until Rockula turns into a bat in front of her. A long cat-and-mouse chase ensues all over the castle, and eventually the Flintstones and Rubbles are cornered inside the Rubbles' room. Fred challenges Rockula to a fight, using a bat statuette as a weapon, but the statuette turns out to actually be the switch for the trapdoor to Rockula's laboratory, which Rockula and Frankenstone were unknowingly standing on. As Fred raises the statuette to strike, both Rockula and Frankenstone fall through the trapdoor, and the Flintstones and Rubbles escape and return to Bedrock. Wilma invites Betty and Barney to stay for dinner and leaves the three of them in the living room while she goes into the kitchen to cook.
Unbeknownst to them, Count Rockula has flown (in the form of a bat) all the way from Rocksylvania to Bedrock. Flying through the kitchen window, he transforms into a vampire, begging Wilma to be his bride. Winking at Fred, Barney, and Betty (watching surreptitiously from the doorway) Wilma agrees to consider marrying Rockula, then immediately begins nagging him about chores, upkeep of the house, and his bad habits. Aghast, Count Rockula changes back into a bat and flies off, claiming to need another 500 years of rest. Barney laughs and lauds Wilma for telling Count Rockula "the truth about marriage".
Images of the once again-vacant Rocksylvania hotel are shown during the end credits.