Hulu subscribers can soon access Showtime content — at an additional cost

Hulu and Showtime, two unlikely partners in the increasingly raucous TV battlefield, are teaming up to build up their streaming arsenals.

Hulu will offer its nearly 9 million paying subscribers Showtime’s stand-alone service for an extra $8.99 a month, giving them access to hit shows like “Ray Donovan” and “Masters of Sex.” The deal also enables Showtime to tap a wider audience as it launches its own stand-alone streaming service next month.