Batman / Teenage Mutant Ninja Turtles Adventures #4

Synopsis

While fighting the Scarecrow, Batman, Leonardo, and Raphael are exposed to his fear gas and see their worst nightmares. Meanwhile, Donny, Mikey, Batgirl, Robin, and April battle Foot Clan soldiers controlled by the Joker, who has incapacitated Shredder with his laughing gas. The heroes reunite at Shredder's lair to battle The Joker and Harley. In the aftermath, Donny discovers that someone has been manipulating the Kraang portals that allowed that Batman's villains to cross over into the Turtle's dimension.