Nicole found herself on the block in this week's double elimination on Big Brother.

Zach Narrowly Escapes Eviction

Derrick, Cody and Hayden began the episode absolutely certain that Zach was on his way out, though they decline to tell neither Zach nor Frankie their suspicions. Instead, Frankie walks in on Cody and Derrick conspiring, and, though Cody tries to cover, his painfully awkward attempt at deflection doesn’t quite do the trick. It’s Derrick that convinces Frankie that Zach is going to be evicted this week.

When Caleb hears that the boys are plotting to get rid of Zach, he convinces them that they need Zach for their alliance. Zach may be an untrustworthy manipulator, but at least he’s on their side (for now). Plus, Frankie, Cody and Derrick begin to suspect that Nicole and Hayden are just manipulating them in the hope of booting Frankie from the house. In the end, Jacosta is sent home and Zach is saved from eviction.

It’s time to crown a new Head of Household with a math and memory competition, in which the houseguests are asked mathematical questions on previous challenges. It takes only two questions to narrow down the competition to Caleb and Christine, and four questions for Caleb to emerge victorious, making him the new HoH.

Caleb Puts Nicole And Hayden On The Block

Caleb puts Hayden and Donny on the block and Nicole knows that, should either of them win the veto competition, she would be facing possible eviction. The veto competition is a physical challenge, and Donny wins. Donny uses his veto to take himself off the block and Caleb wastes no time in replacing him with Nicole.

In their last appeals to their fellow houseguests, Hayden and Nicole both blame Frankie and Christine, suggesting that they are the ones others should be worried about, not them. At the vote, Cody and Donny try to evict Nicole, but Derrick, Christine, Frankie, Zach and Victoria all vote to evict Hayden and he is sent home.

With Nicole sticking around, Cody and Donny are both worried that Nicole will find out they were the two who voted her out, because she is pissed off and shows no signs of stopping until she gets her revenge.

Big Brother airs Sundays and Wednesdays at 8 p.m. and Thursdays at 9 p.m. on CBS.