I'm a Celebrity...Get Me Out of Here, Spencer Pratt, Heidi Montag I'm a Celebrity...Get Me Out of Here, Spencer Pratt, Heidi Montag

Heidi and Spencer Pratt are heading back to the jungle for Wednesday's finale of I'm a Celebrity... Get Me Out of Here! (8 pm/ET on NBC), the show's executive producer told TVGuide.com.

"They arrive fist thing in the morning [on Tuesday]," Jayson Dinsmore said. "I'm expecting my phone to blow up in about 24 hours."

The Pratts repeatedly tried to quit the show, and then asked to return. During their second stint, Heidi was rushed to the hospital with a stomach illness, which ended the couple's run in the competition.

But the Pratts won't be the only former cast members returning for the finale; the rest of their fellow former castoffs will also be back.

"It was such a roller coaster of a show that we felt like, to put the cherry on the icing, we needed to bring everyone back, so we get closure across the board," Dinsmore said. "It's a pretty emotional roller coaster, to live in the jungle for 25 days."

The first half of the finale will include a reunion dinner and "remembering the journey itself," he explained. Afterward, the Season 1 winner will be crowned.

The memories, however, won't necessarily be all pleasant nostalgia. The show's present and former cast members will also have the chance to offer their perspectives on their experiences — positive and negative.

"I think it's going to be an all-out battle, I'm sure," Dinsmore said. I can't wait until the claws come out for Heidi and Spencer. I'm sure they've got a few things to say. ... It will be full of fireworks."

After the couple returned to the United States, they appeared on The Today Show for an interview with Al Roker which Heidi said left her in tears.

"There were ups and downs [for them]," Dinsmore said. "I've been following since they left, the sort of press push between them and Al Roker. I think what's played out in the press is pretty true to the emotional journey of trying to live in the jungle. ... It's a major shock to the system. And you have to settle in, and if it wasn't what like what you're expecting, it's tough."

As I'm a Celebrity approaches the end of its first season on NBC, Dinsmore is grateful to the couple for participating. "My hat's off Heidi and Spencer, because they gave us great TV," he said, adding, "My hair's grey... ."

Will you tune in to see their return?