Property Brothers star Drew Scott was the first to dance, alongside partner Emma Slater, with a quickstep set to Louis Prima's "Sing, Sing, Sing (With a Swing)." However, the day before the live show, Scott hurt himself during dress rehearsals.
As they practiced on stage, Scott was trying to work on some of the feedback judge Len Goodman had given during the premiere, and he ended up pulling his hamstring. However, the fast-paced routine ended up being the perfect dance for him.
After getting their mostly positive feedback from the judges, Scott and Slater joined co-host Erin Andrews backstage, and the HGTV star said he's still feeling the pain, but it's manageable.
"It's a little sore, but if I'm not bending low [it's okay]," Scott said. "This was the perfect dance for me, because I didn't have to go deep into the squats. I felt really good and I just wanted to bring the energy."
Lachey showed off the gruesome injury in the pre-taped package before her performance, and she didn't seem too excited to be stuffing her tender feet into tight dancing shoes.
However, the charismatic mother of three came out with partner Maks Chmerkovskiy and owned the dance floor in a dazzling golden gown as the pair performed a foxtrot set to Tami Tappan Damiano's "Hit Me with a Hot Note."
For Frankie Muniz, pain was expected. A few years ago, the Malcolm in the Middle star broke his back after crashing a race car, and the strain of dancing has been causing serious discomfort and pain.
However, like his fellow injured DWTS castmates, the 31-year-old actor didn't let it keep him from delivering an incredible tango with partner Witney Carson, set to "Whatever It Takes" by Imagine Dragons. Decked out in a red tux, the talented star brought everything he had to the dance floor.
Speaking to Tom Bergeron after getting feedback from the judges, Muniz explained that he's been "literally doing everything" possible to stay healthy enough to stay on the show.
"This is so much physical work that you wouldn't expect, not being a dancer. It's so hard but I love it, and I'm doing everything I can to be healthy," he explained. "I did cryotherapy, physical therapy, I'm in the sauna, I'm icing, I'm doing yoga, I'm doing everything I can just to be here."
One reason the show might have seen so many injuries this early is because the stars were expected to learn two full dances in one week, as DWTS returns on Tuesday for their second show of the week. Tune in at 9 p.m. ET/PT on ABC to see how the stars handle their Latin Night performances.