Issue Batman & Superman: World's Finest 1
Subtitle Year One: Different Worlds
Date April 1999
Writer(s) Karl Kesel
Artist(s) Dave Taylor, Robert Campanella
storyline Clark Kent prepared to interview his childhood friend, Dr. Harrison Grey, at a gala to dedicate his new plastic surgery center. Bruce Wayne prepared for the same event, after being reminded of it by his butler, Alfred. Kent and Wayne were introduced by their common friend. Dr. Grey spoke of his center, which would focus on birth defects and scarring - not cosmetic surgery, and retired. Backstage, he was kidnapped. Superman and Batman both arrived on the scene quickly. They disagreed on how to handle the situation and went their separate ways. Eric Stag, a wannabe vigilante who preyed on rapists, had captured the doctor in hopes of getting a new face. Batman and Superman stopped him, but Dr. Grey was hit by a car and killed trying to escape.

Issue Batman & Superman: World's Finest 2
Subtitle Year Two: A Tale of Two Cities
Date May 1999
Writer(s) Karl Kesel
Artist(s) Dave Taylor, Robert Campanella
storyline On the first anniversary of Dr. Harrison Grey's death, both Batman and Superman visited his gravesite. Not understanding each other, they agreed to work together that night - half in Gotham City, half in Metropolis. In Gotham City, they took down a group of crooks who'd worked for various other criminals calling themselves the Henchmen. Batman and Superman discussed each other's methods and the reasons both had not joined the JLA. In Metropolis, they stopped a madman who had a device that could control metal (he claimed to be from the future). They agreed to meet again on the next anniversary of Dr. Grey's death. 

Issue Batman & Superman: World's Finest 3
Subtitle Year Three: Light in the Darkness
Date June 1999
Writer(s) Karl Kesel
Artist(s) Dave Taylor, Robert Campanella
storyline Gordon and his men took down a gang trying to rob an armored car. A man in a Superman outfit tried to help and was delivered to Arkham Asylum. The fake Superman turned out to be Clark Kent in kevlar hoping to get an exclusive story on the asylum. When a breakout occurred, Kent turned out to be the real Superman. Batman arrived and helped him control the situation.  

Issue Batman & Superman: World's Finest 4
Subtitle Year Four: Underworlds
Date July 1999
Writer(s) Karl Kesel
Artist(s) Dave Taylor, Robert Campanella
storyline Batman headed to Metropolis when he learned someone was hacking satellites to spy on Superman. Superman was busy with an apartment building fire when Batman arrived. Batman told him he'd found the location of the trackers. It was learned that they were only piggy-backing on the feeds. Batman went to find the real trackers and they turned out to be a government agency planning to clone the Kryptonian. He destroyed their data and warned them to shut down.

Issue Batman & Superman: World's Finest 5
Subtitle Year Five: A Woman's Work
Date August 1999
Writer(s) Karl Kesel
Artist(s) Dave Taylor, Robert Campanella
storyline Superman visited Gotham City tracking some criminals. He found them already taken care of by Batgirl. They teamed up to search for the rest of their gang, but Batman already had them (with help from Thorn). The group had planned to frame Barbara Gordon in order to "buy" her father, the commissioner of police.

Issue Batman & Superman: World's Finest 6
Subtitle Year Six: The Imp-Possible Dream
Date September 1999
Writer(s) Karl Kesel
Artist(s) Peter Doherty, Robert Campanella
storyline Bat-Mite and Mr. Mxyzptlk stopped time to decide who was better - Superman or Batman. They put Lois Lane on a building being attacked by Kryptonian birds. Superman and Batman (with help from Robin) got to her at the same time. All four were placed in a booby trapped funhouse. Robin suggested he team with Superman (and Lois with Batman) so that neither imp would sabotage the contest. Mxyzptlk gave Lois super powers, Bat-Mite gave Batman super powers. Each time exited at the same time; the 5th dimension beings left.

Issue Batman & Superman: World's Finest 7
Subtitle Year Seven: A Better World
Date October 1999
Writer(s) Karl Kesel
Artist(s) Peter Doherty, Robert Campanella
storyline After the death of Jason and the paralysis of Barbara, Superman visited Batman in the cave. He confessed that he'd killed some of his enemies. When Batman ordered him away, Superman grabbed him and flew him to Smallville. He showed Batman what he fought for (instead of Batman's fighting against things). He helped Bruce come to grips with the loss of his partners. A doctor making a house call had a heart attack. Batman resuscitated him while Superman delivered his patent's baby.

Issue Batman & Superman: World's Finest 8
Subtitle Year Eight: Cat and Mouse
Date April 1999
Writer(s) Karl Kesel
Artist(s) Peter Doherty, Robert Campanella
storyline Bruce Wayne, at a business meeting with Lex Luthor, congratulated Lois Lane on her engagement to Clark Kent. Catwoman stole plans for LexCorp's new jet from under Luthor's nose. Superman and Batman arrived and got on Catwoman's trail. She grabbed Lane and made for her escape route. Superman caught her and recovered the plans, but Catwoman escaped after detonating some of the charges she'd planted. Lex Luthor was reportedly killed the next day while testing the plane.

Issue Batman & Superman: World's Finest 9
Subtitle Year Nine
Date December 1999
Writer(s) Karl Kesel
Artist(s) Graham Nolan, Sal Buscema
storyline PART ONE - WHEN IT REIGNS...IT POURS: 
After the death of Superman, six imposters showed up at a crime scene and fought each other. Batman came in and stopped the robbery. He left when none of the Supermen knew why he was in Metropolis. 
PART TWO - KNIGHT'S EDGE:
Months later, after the real Superman returned, he showed up in Gotham City and met with Batman (AzBat). He realized he wasn't the real Batman, but hoped he could continue the legacy.

Issue Batman & Superman: World's Finest 10
Subtitle Year Ten: War of the Worlds
Date January 2000
Writer(s) Karl Kesel
Artist(s) Dave Taylor, Tom Morgan, Robert Campanella
storyline A breakout occurred at both Stryker Island Prison in Metropolis and Arkham Asylum in Gotham City. Batman and Superman met in Gotham (the Metropolis criminals were hoping to take over GC, while the Gotham criminals planned to keep them from it). They took down Bloodsport and Deadshot; Batman called Oracle for reinforcements. Steel, Supergirl, Superboy, Robin, Nightwing, and Azrael arrived quickly. Azrael and Steel took down Metallo; Superboy and Robin caught Poison Ivy; Nightwing and Superman got Charaxes and Hellgrammite; Batman and Superman got the Riven Twins. Two-Face appeared with the not-dead Dr. Harrison Grey. They took him down and rescued their old friend. It appeared that Grey's body double had been killed ten years before and he'd contracted amnesia due to the occurrences.