"The Plants of Plunder": Batman and Robin meet a gang of thieves who use the powers of alien plants in their robberies. After a lengthy chase, the Dynamic Duo finally learn that the thugs managed to capture an amnesic alien and they've
- So gangland is now calling me a baby! Well, I'll dress like a baby, and prove them that I'm still a crime-fighter-- as Bat-Baby!
- — Batman
Synopsis for "The Plants of Plunder"
Batman and Robin meet a gang of thieves who use the powers of alien plants in their robberies. After a lengthy chase, the Dynamic Duo finally learn that the thugs managed to capture an amnesic alien and they've been using the alien's plants to commit crimes. When the alien recovers his memory, he turns against the criminals and helps Batman capture the crooks before returning to his home planet along with his alien plants.
Appearing in "The Plants of Plunder"
Synopsis for "The Secret of Mystery Island!"
Batman, Robin, and a gang of crooks search an island for the loot of a dead criminal. Following a series of clues, Batman and Robin confront the gangsters and capture them one at a time until they finally confront the leader, who has found the last clue. The thug is disappointed to find nothing of value and he is soon captured by the heroes. Later, Batman tells Robin that the crook misunderstood the last clue and missed the treasure, which consisted on valuable pieces of art stolen from various museums across the world.
Appearing in "The Secret of Mystery Island!"
- Catlin (Single appearance)
- Hoke (Single appearance)
- Danny (Single appearance)
- Briggs (Only appearance; dies)
- Gotham City
- Mystery Island
Synopsis for "Batman Becomes Bat-Baby"
With a ray of his own devising, a criminal scientist turns Batman's body into that of a four-year-old. Having the mind and strength of an adult, Batman modifies his costume and continues to fight crime as Bat-Baby. At first, criminals were overconfident about confronting Bat-Baby, but when Batman starts capturing criminals at the same rate as an adult, they start to worry. Finally, Bat-Baby and Robin are able to locate the criminal scientist and his machine. The heroes confront the villain and Robin keeps most of the thugs distracted while Bat-Baby uses the machine to revert his change. Batman returns to his normal size and captures all the criminals. Afterwards, Batman decides to keep the Bat-Baby costume as a trophy in the Batcave.
Appearing in "Batman Becomes Bat-Baby"
- Nails Finney (Single appearance)
- Garth (Single appearance)
- Swap Smith (Single appearance)
- Gotham Gazette Editor
- Kathy Kane (Cameo)
- This issue is the 600th appearance of Batman.
- Due by-and-large to the Batbaby story, this issue has become one of the most infamously ridiculous comic books of all time.