Just when they thought they were out, they Battle Back-ed in.

Victor returned to Big Brother 18 after winning the first-ever Battle Back competition on Friday's episode, defeating Tiffany in the final round.

In the Redemption Island/Last Chance Kitchen-style twist, with the exception of the last round, the evicted houseguests battled head-to-head in versions of the Head of Household competitions that were held after their respective evictions (genius way to save time and money by production). Jozea topped Glenn in the first round. Victor then beat Jozea, before taking down Bronte.

Big Brother 18: 24 times Paulie was too obsessed with Vanessa

Victor will compete for HOH with the rest of the houseguests, which should be very interesting now that the teams and the Road Kill twists have been dissolved.

Victor told TVGuide.com after his eviction that he would "go in Rambo" if he returned, and he certainly has the ammunition after Tiffany advised him to trust Frank and not to trust Da'Vonne.

"While I was in there originally, I tried not to ruffle feathers," he said at the time. "What I know now, being evicted 9-1, I'd go back with no filter and not try to be nice to everyone. I'd go in Rambo."

As if Victor's return wasn't enough, Julie Chen dropped another case of "expect the unexpected" at the end of the episode: There are clues in the house that will unlock a secret room. If a houseguest figures it out, they will gain a new power. There will be more details on Sunday's episode.

Big Brother
airs Sundays and Wednesdays at 8/7c and Thursdays at 9/8c on CBS.

(Full disclosure: TVGuide.com is owned by CBS.)