The Second Coming of Leonard - S1.E15

When Dharma's charismatic old boyfriend, Leonard, suddenly re-enters her life after a year in India, Greg finds himself extremely uncomfortable around him—especially when it becomes clear that absolutely everyone else, from Greg's parents to even Marlene, absolutely adores Leonard. Weakened by battling a bad cold, Greg is thrown for a loop when Leonard reveals that he has been celibate since he left Dharma and Dharma decides that she and Greg should give abstinence a try as well. Finally, Dharma informs everyone that they should respect Greg's wishes and not see Leonard any more—then everyone simultaneously spots Greg on television enjoying Leonard's company and his benchside basketball tickets.