Batman has what is possibly the most famous headquarters in all of comics. The Batcave is not something created whole, as current continuity would suggest. In the Golden Age, it was developed after Batman used secret rooms in Wayne Manor and a barn on the Manor's grounds. Over time, the Batcave evolved into one of the best headquarters in comics.
Various criminals have broken into the Batcave. The first was Wolf Brando, who died after falling into the underground river. Those criminals only count if Batman took them to the Batcave, as he did with some, either wittingly or unwittingly.
10 Robin (Dick Grayson) Was There As The Batcave Evolved
It's only right that Dick Grayson is the first since he became part of Batman's war on criminals as the Batcave evolved from a secret tunnel to a fully-stocked cavern. As his partner, much of the Batcave was made to not only assist Batman but train Robin.
Robin also would usually be the one to point out trophies that Batman would keep in the Batcave. The trophies seemed to be used to remind the Boy Wonder of important crime-fighting lessons. As the 1940s went on, the Batcave became almost a home for the Dynamic Duo as well.
9 Alfred Beagle (The First Butler For Batman & Robin) Quickly Found Out The Superheroes' True Identities
When Batman and Robin first got their trusty butler Alfred, he wasn't the Alfred Pennyworth that the modern comic audience has known. He was a portly butler named Alfred Beagle. His appearance changed in response to the popularity of the Batman serials that ran in theaters.
Alfred proved to be indispensable, especially after he was able to deduce that his employers were Batman and Robin in his very first story in Batman #16 by Don Cameron and Bob Kane. As time went on, Alfred would aid the duo in many adventures.
8 Ed Rogers (A Bruce Wayne Lookalike) Switched Places With Batman
In Batman #45 by Bill Finger and Charles Paris, a convict named Ed Rogers is a dead ringer for Bruce Wayne. He's a model prisoner so he's given parole for Christmas. Unfortunately, he's nearly killed on his way to propose to his girlfriend. Fortunately for him, Batman and Robin save him.
Batman takes Rogers's place, even going back to prison. Batman foils a massive jailbreak that Rogers knew of. In light of Ed Rogers's honesty, the Prison Board extends his parole to a permanent one. Rogers goes home, at last, to live out the rest of his life with his loved ones.
7 Vicki Vale Was Determined To Learn Batman's True Identity
In Batman #49 by Bill Finger and Bob Kane, Vicki Vale, a news photographer is introduced as a Lois Lane type of character. She is tasked with getting photos of Batman in action. In the process, she becomes suspicious that Batman is secretly Bruce Wayne.
Her visit to the Batcave comes in the course of this mission to follow Batman on a case. She's blindfolded, a common tactic the Dark Knight used in taking people to the Batcave. Fortunately, she didn't learn anything she could use on that trip, and Batman went on dating Vicki Vale despite her persistence in learning his true identity.
6 Jimmy, "the Second Boy Wonder," Received Training From Batman
In Batman #50 by Bob Kane and Lew Sayre Schwartz, Robin discovers that Batman is spending time in the Batcave training a young boy. Robin's convinced that this boy Jimmy is going to be his replacement. He trails them on a mission and witnesses Jimmy save Batman's life.
Robin confronts Batman who sends his sidekick to take Jimmy a spare Robin costume. Batman is captured by the criminal "Gloves." Robin and Jimmy rescue him, and Robin learns that Jimmy is blind, but wants to be a criminologist, which is why Batman is training him.
5 The Penguin's Henchman Hagan Was Brought In For Interrogation
In 1948's Detective Comics #134 by Bill Finger and Jim Mooney, Batman captured one of the Penguin's henchmen, a man named Hagan. With the Penguin having escaped, Batman needed to know where he would strike next. However, Hagan wouldn't talk.
Batman takes Hagan to the Batcave and puts him in a special interrogation room lined with mirrors. Flashing colored lights and a booming speaker break down Hagan's resolve. He cracks under Batman's psychological torture.
4 J.J. Jason, A Writer Of Detective Stories, Wanted To Deduce Batman's Identity
In World's Finest #39 by Jim Mooney, detective writer J.J. Jason tried to deduce Batman's true identity. He fakes being targeted by a criminal to get close to Batman. Batman takes him blindfolded to the Batcave, and Jason tried to deduce its location by the travel time.
It's a very clever process that Jason uses, triangulating where Batman and Robin must be coming from. He also gathers information on Batman himself. Batman realizes Jason's plan and when confronted at Wayne Manor, he's hired a deaf and blind man to impersonate Batman.
3 Jack Fasset, A Fence For Stolen Jewelry, Is Brought In For Questioning
Just a month later, in Detective Comics # 146 by Bill Finger and Dick Sprang, Batman is trying to track down a criminal gang led by Carl "Numbers" Cave, convinced that three is his lucky number. All of his crimes have something to do with the number three, and this modus operandi has outwitted even Batman.
Batman abducts Jack Fasset, a notorious fence that Numbers must be using. He brings the unconscious criminal back to the Batcave and convinces him that he's locked in a cabin on a ship. The rocking and splashing make Fasset so seasick that he tells everything he knows about Numbers' next job.
2 Dr. Gaige Of The Voyager's Club Helps Batman Build A Bat-Submarine
To catch the submarine criminal known as Tiger Shark in Detective Comics #147 by Dick Sprang, Batman recruited Dr. Gaige, the head of the Voyagers' Club to help him build a Bat-Submarine. Gaige is overly helpful, designing an exquisite submarine for Batman's fleet of special vehicles.
Tiger Shark constantly thwarts Batman and Robin, but each escape gives Batman more information that he needs to crack the case. Of course, Tiger Shark turns out to be Dr. Gaige. He sends Gaige and his gang to prison and adds Tiger Shark's helmet to his trophy room in the Batcave.
1 Selina Kyle-Wayne (the Earth-2 Catwoman) Aided Batman & Robin
Before she became the Earth-2 Batman's wife, Selina Kyle was the criminal known as Catwoman. In Batman #62, by Bill Finger, Bob Kane, and Lew Sayre Schwartz, she was working with another criminal named "Mister X." She was struck by a brick while saving Batman from a falling wall and regained her memory lost years before in a plane crash, causing her to become a criminal.
She helped Batman and Robin capture Mister X by pretending to still be working with him. While the plan nearly got her killed, Batman managed to save her and put Mister X away. She aided Batman in later cases, beginning a relationship that ultimately ended in marriage and a daughter.