In what Star Trek episode does Spock ask the nurse to sap him repeatedly?

I'm working on a parody video and I need to find this clip but can't remember which episode it occurrs in. The scene has Spock in the sickbay in a coma-like state. Theres an black doctor who instructs Nurse Chappel that if Spock should regain partial consciousness, do whatever he asks you. Spock does come too and tells the nurse to slap him rpeatedly. I need to know the name of this episode.