The finale of Big Brother 15 airs Wednesday night and will feature the final Head of Household competition, the final eviction and the crowning of a winner.

Houseguests: Andy Herren, GinaMarie Zimmerman and Spencer Clawson.

Below is a review of the final three houseguests left in the competition and a preview of their chances of winning.

Andy:

Though he was quiet through the first part of the game, Andy eventually made a final four alliance with Amanda, McCrae and Aaryn Gries called 3AM. The alliance stuck together until Elissa Slater won HOH with eight people left. Elissa targeted Aaryn for eviction and Andy decided to switch alliances and work with GinaMarie, Judd Daugherty and Spencer. They named themselves The Exterminators.

They targeted Amanda after Aaryn was evicted and Andy told Amanda that she would definitely vote for her to stay. He chose to vote to evict Amanda instead and framed Elissa for the vote. When McCrae won HOH next, Andy convinced him to target Elissa and The Exterminators promptly voted her out. Andy made his way to the final three and may win if he gets to the final two. Against GinaMarie he would likely have Candice Stewart, Helen Kim, Amanda Zuckerman and Spencer's votes at least. He could possibly get every vote if he was against Spencer.

GinaMarie:

GinaMarie attached herself to the wrong side of the house at the beginning of the game. In the process she was out of the loop when the house voted to evict Nick, her "showmance." She had a fight with Candice early in the season and has had arguments with Aaryn and Amanda. She managed to make it to the final eight, at which point she became a part of The Exterminators alliance.

After she won HOH at the final seven she nominated Amanda and McCrae, which was seen as a game-changing move. McCrae won the Veto and took himself out, causing GinaMarie to nominate Spencer in his place as a pawn. GinaMarie cast the sole vote to evict Amanda when the votes tied. At the final four she was also the sole vote to evict McCrae. If she makes it to the final 2 she will likely have Jessie Kowalski, Elissa, Judd's votes either way and has a good chance of winning if she's next to Spencer.

Spencer:

Spencer joined the Moving Company alliance at the start of the season but that alliance proved to be disastrous, as three of its five members were evicted in the first five weeks. He became a perennial pawn no matter who won HOH and has broken the record for most times being nominated in one season. He joined The Exterminators alliance at final eight and voted along with their agenda whenever he wasn't a nominee for eviction himself. He won HOH at final five and helped lead the charge to get Judd out after McCrae won the Veto.

Spencer caused very few conflicts this season and is generally seen as a good social player. If enough jury members are bitter about their evictions he may win the game against GinaMarie and could possibly win against Andy.

Wednesday's live finale will find GinaMarie and Andy facing off in part 3 of the final HOH competition after winning part 1 and 2, respectively. Whoever wins will have the power to evict one more person before facing the jury. The jury will then vote for who they think deserves the money. The episode airs at 9:30 p.m. on CBS.

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Big Brother 15