"Attack of the Invisible Knights!"
A collection of Black Opals that date back to medieval times are presently on display at the Gotham Museum, however each night it appears as though the suits of armor on display are moved every night. Finding it suspicious, Batman and Robin are called in to investigate.
That night the dynamic duo are attacked by the suits of armor, and afterwards find that the opals have been stolen, and that the suits of armor weren't possessed by ghosts, but controlled with magnets instead. Batman and Robin then track the Opal's to museum employee Abner Jenkins who is attempting to sell them off. Batman and Robin stop them and turn them over to the police. The very next day, Batman and Robin in their civilian identities of Bruce Wayne and Dick Grason go and see the Opals on display.
"Robin's Unassisted Triple Play!"
After a night of studying, Dick Grayson goes down to the Batcave to see what Bruce Wayne is up too. There, he sees that Bruce has put on the finishing touches on a video survalance system that allows them to monitor Gotham City. Noticing a crime in progress, the two change to Batman and Robin and rush out to stop the crooks involved. However, Batman gets an urgent call from the Justice League of America, and so leaves Robin to handle the situation on his own.
Unable to stop the crooks (who use plants to execute their heists) Robin tracks them to their base, and attacks them. By creating a distraction (a rock crashing through the window) to make the crooks think that Batman is also present outside, Robin is able to gain the upper hand and capture the crooks.
The next day, Robin reports to Bruce explaining that he was able to give the illusion that Batman was there by putting a rock on a pulley system to make the rock crash through the window.