Sleepwalker exchanged bodies with Rick Sheridan, and battled Cobweb, the Chain Gang, 8-Ball, and the Hobgoblin. Later in the series, Sleepwalker is revealed to supposedly be the lead scout for the dimension conquering Mindspawn race, an invasion force from the Mindscape intent on conquering Earth. However, in actuality, Cobweb had put in motion a complicated plot to invade the Earth and disrupt Rick's relationship with Sleepwalker. This involves disguising his minions as members of Sleepwalker's race and framing his archenemy as their leader. The plot is only partially successful; Sleepwalker and the Avengers thwart the initial attack, although Sleepwalker's reputation was ruined in the process. Many people still mistakenly believe that Sleepwalker's race planned to invade and conquer the Earth and that Sleepwalker himself was an advanced scout for the invasion force, betraying his own people to protect humanity.