Master thespians Hen and Bunny are no strangers to the stage, but even their loyal fans may be unaware that, before cofounding the Hen and Bunny Theatre, Bunny had several prominent roles on Broadway, including Cosette in “Les Miserables” and Sarah in “Guys and Dolls.” This experience came in handy when the pair dedicated themselves to portraying the grueling auditions of NBC’s “Grease: You’re The One That I Want.” “I don’t want to pretend that I feel music more deeply than other people,” says Bunny. “But I do.”