“Riverdale” actor Luke Perry has been hospitalized after experiencing a massive stroke.

Authorities were reportedly called to the star’s Sherman Oaks, California, home around 9:40 a.m. Wednesday and Perry was transported to the hospital. His condition remains unknown, TMZ reported.

The 52-year-old’s representative told People that the star is “currently under observation” at the hospital.

Perry stars as Archie’s dad on CW’s “Riverdale” and is also know for his role on the classic show “Beverly Hills, 90210.”

The medical emergency happened the same day that Fox announced plans for a six-episode "90210" reboot this summer. Original cast members Jason Priestley, Jennie Garth, Tori Spelling and Ian Ziering have all signed on, but Perry hadn't and neither had co-star Shannen Doherty.

Reaction on social media was swift to news of Perry's hospitalization. 

"My friend. Holding you tight and giving you my strength. You got this," wrote Doherty. 

Added Ziering, "No words can express what my heart feels hearing today's shocking news. Let us all say a prayer for his speedy recovery."

Perry has had health issues before. In 2015, he was treated for precancerous growth found during a routine colonoscopy. He later became an advocate for colon cancer screening. 

According to the U.S. Centers for Disease Control and Prevention, 66 percent of people hospitalized for a stroke in 2009 were over the age of 65. Perry is just 52.

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