Brad Oscar and J. Fred Shiffman star in The Mystery of Irma Vep at Arena Stage.

Brad Oscar and J. Fred Shiffman are the newest odd couple to hit the D.C. stage in Arena’s The Mystery of Irma Vep. And they pull it off twice in one night, first matching wits as a pursed-lipped housekeeper and a gauche stableman, then as a histrionic former actress and her brooding Egyptologist husband. Along the way, they don the roles of tomb guide, ancient mummy and mysterious intruder to boot.