FIRST ALLIANCES: THE GAY CARD AND "SHE'S MY SISTER?!"

Jase, Drew, Scott and Michael quickly form a bond. Scott dubs them the "Knights of the Round Table," and there is camaraderie to spare between the boys.

Will, the 26-year-old registered nurse from Tupelo, Mississippi, lets Lori know that he's gay. He admits, "I don't want to play the Gay Card too early. I want us to just be sitting around at dinner one night, and I'll let slip about my boyfriend or something." Will feels a kinship to both Lori and Karen, the 30-year-old artist from Saddle Brook, New Jersey, and admits to being worried about "the Alpha Male contingent."

But the real excitement and energy comes from the slow revelation that Michael and Jennifer share a father. As everybody is talking about where they're from and talks about their parents, it becomes increasingly clear to Michael that Jennifer is the little sister he never knew he had. The few things Michael had ever known about his father were that his last name was Dedmon, he served in Vietnam and lost part of his foot while on tour there. As Jennifer reveals her last name, that her father did a tour in Vietnam and that he had part of his foot blown off, Michael begins to piece it together and manages to keep a lid on his emotions at the same time. "My emotions started tripping out hardcore. I was gasping for air." In a revealing moment, Michael admits that he came to win the money for his family, but it feels good to know who his father is.

TREADMILLS OF TERROR TO BE HoH

When the first Head of Household (HoH) Competition forces the HouseGuests to partner up, Will is the odd man out. The HouseGuests are split into six pairs, each with a Walker and a Talker. Julie will ask each of the Talkers a question that can be answered with yes or no. Depending on whether they answer the question correctly, their partner, the Walker, who is positioned on a treadmill, will have their speed increased or left the same. Whoever lasts the longest will have a shot at being Head of Household. Whoever loses slides back into a pile of mud and loses the chances of becoming HoH.

After a few rounds of questions highlighted by Marvin and Holly both getting questions about themselves wrong, the final teams are Scott and Jase versus Karen and Lori. But after 27 minutes of running, Karen falls back into the mud, leaving Jase and Scott the last team standing. Julie calls Will into play with the tiebreaker question, a question about himself that Jase answers correctly, thus becoming the first HoH!

Who will Jase nominate? What will happen if Michael tells Jennifer that he thinks she is his half-sister? Find out Thursday at 8PM ET/PT on the next episode of BIG BROTHER 5.