"That's Really Super, Supergirl" is a guitar pop song that references the DC Comics character Supergirl, although Partridge stated the "Supergirl" in the song "isn't one girl -- it's an amalgam of all the women who had better things to do than be around me. .. there's a facetious part of it, a little sarcasm in it." Its lyrics also mention kryptonite and Superman's Fortress of Solitude. Rundgren contributed the keyboard part but was left uncredited. Gregory: "We really didn't know what to do with it. It was just a 'B' side, and he could obviously see possibilities in it. One afternoon, we just left him to it." The snare was sampled from the Utopia album "Deface the Music" (1980). Because of recording logistics, Prince and Moulding were forced to play around the beat. The guitar solo was played by Dave Gregory on Eric Clapton's psychedelic Gibson SG the Fool, then owned by Rundgren. Gregory spent hours rehearsing the solo. Years after the fact, he realised that he had subconsciously lifted the "little five-note runs" heard in the trumpet line of "Magic Dragon Theatre" from the Utopia's "Ra" (1977).