ST. MARYS — Unlikely alliances are made when Snoopy seeks help to protect his pumpkin patch from zombies.

He knows it will take serious firepower to fend off the undead, so Snoopy hires the dreaded Darth Vader and a stormtrooper to stop the zombie invasion.

The scene will unfold four times a day Saturday and Oct. 29 at a ghost village set up at the midway point of the latest themed steam locomotive ride offered by St. Marys Express.

Barbara Ryan, ride’s entertainment director, said the Halloween Express theme may sound too intense for younger children, but that’s not the case.

“The zombies are more funny than scary so kids of all ages will enjoy their antics as the story unfolds,” she said.

During the ride in open-air cars, riders will be entertained by a witch and hobos portrayed by actors with St. Marys Little Theatre.

Ryan said she expects the rides to sell out quickly.

“The Halloween Express has always been one of our most popular events with children and adults,” she said.

Stationmaster Doug Vaught said that a majority of train passengers are from out of state, and many are return passengers.

“Every ride is different, so it keeps them coming back again and again,” he said. “Unlike haunted houses, the Halloween Express will be an experience that everyone, even the faint of heart, can enjoy.”

Train passengers can also tour the St. Marys Railroad Museum at the train station before or after the ride at no charge.

The Halloween Express departs from Theatre by the Trax, 1000 Osborne St. at 10 a.m., noon, 2 p.m. and 4 p.m. on Oct. 22 and 29.

Tickets are $20 for adults and $17 for children 3 to 12. Children 2 and under ride free. Tickets must be purchased in advance at stmarysrailroad.com or by calling 200-5235. Groups of 10 or more can get a discount code by calling 729-1103.