Club D was a members-only nightclub owned and operated by Nick Damiano. While being chased by Selene, Rachel Summers ducked into the club only to be overwhelmed by the diversity of thoughts by the club's patrons. She was nearly thrown outside by the bouncer, who suspected that Rachel was a drug addict, but was stopped by Nick, who took pity on her and took her to his nearby apartment. Selene, unfortunately, continued to track Rachel, and so murdered Nick, draining him of his life energy, before the X-Men could arrive.
The fate of Club D without Nick is unknown.