Lady Gaga has recorded a guest spot for an episode of The Simpsons!!! In the episode "Lisa Goes Gaga", Lady Gaga (playing herself) stops her Gaga Express train in the Springfield and tries to cheer up Lisa, who has become a complete social outcast. Using the power of positive thinking and song, can Gaga teach Lisa – and everyone in Springfield — that individuality beats conformity? We must believe so! "Lisa Goes Gaga" airs May 20 on Fox.