One day, while defending Gotham City, Batman (Adam West) and Robin (Burt Ward) learn that there is a plot to abduct Commodore Schmidlap from his yacht. Quick! To the batcopter! Flying over the ocean, they locate the yacht but it turns out that the whole kidnapping plot was a ruse for a shark to attack Batman!Batman: The Movie (1966, directed by Leslie H. Martinson)
Saw this a long time ago. I enjoyed the old Batman series.