"Hi Diddle Riddle" is the first half-hour length episode of Batman to air, first broadcast on ABC, Wednesday January 12, 1966 and repeated on August 24, 1966 and April 5, 1967.

After a glimpse into the lives of Bruce Wayne (Adam West) and Dick Grayson (Burt Ward) as well as the opening credits, the riddle leads them as Batman and Robin to the Peale art gallery, where they catch the Riddler in the act of taking a cross from its proprietor Gideon Peale at gunpoint.

However, Dick remembered that the Riddler said to look for two more riddles, and this clue inspires the Duo to get to the Batcave and closely examine the legal document.

As the Riddler and the Mole Hill Mob make their way through an underground corridor to the discothèque, his plan is again put into action.

Batman finds himself in no condition to pursue them and is forced to surrender his keys to the police at the most inopportune time, especially since the Bat-Signal is being activated.