Nexus Meets Madman (1996) #1

In his nightmares, Nexus has seen visions that would wake the dead. And in his role as interplanetary executioner, he's faced down the galaxy's most vicious mass murderers and sentenced them to the most horrible of punishments. But when a renegade robot overcomes Nexus with sickly sweet sensations of cotton candy, pink flowers, and circus music, he must look for help -- and he finds it in the form of Madman!