It’s time for a new set of “I dos”! Married at First Sight‘s season 4 cast members worry they’re in over their heads, and one woman even contemplates becoming a runaway bride, in Us Weekly‘s exclusive first promo for the new batch of episodes.

The FYI unscripted series’ trailer, released ahead of the July 26 season premiere, introduces viewers to the new guys and three gals who will be tying the knot. The participants are Heather Seidel, a 32-year-old flight attendant; Sonia Granados, a 33-year-old social worker; Lillian Vilchez, a 24-year-old realtor; Derek Schwartz, a 35-year-old account executive; Nick Pendergrast, a 32-year-old vacation rental manager; and Tom Wilson, a 28-year-old yacht interior specialist.

“I’m willing to take the risk because I think that if it does work out, it could be the best thing that’s ever happened to me,” Lillian explains about why she decided to take part in the show.

However, giddiness soon gives way to fear for a number of the cast members, who quickly realize they are about to marry someone they’ve never met.

“Everything is rushing at me, and I just feel overwhelmed,” Heather tells the camera while wearing her wedding dress on the big day.

Sonia takes the anxiety a step further by admitting, “All I want to do is run.”

The popular series has a rocky track record of late, with none of last season’s couples opting to stay married. However, previous seasons boast better results, with two season 1 couples — Jamie Otis and Doug Hehner, and Cortney Hendrix and Jason Carrion — still intact. (Sadly, Otis and Hehner revealed in a blog post earlier this month that she had recently suffered a miscarriage.)

Watch the wild trailer in the video above. Married at First Sight, produced by Kinetic Content, returns to FYI Tuesday, July 26, at 8 p.m. ET.