The Scorchers lost the first BBL final to the Sydney Sixers at home and will have to overcome the in-form Brisbane Heat to win the second Big Bash contest.
The Heat only just scraped into the final four, defeating the Hobart Hurricanes by eight wickets in the final match of the preliminary rounds to qualify.
They then overcame the best performed team to that stage in the competition, the Melbourne Renegades at Etihad Stadium by 15 runs led by an unbeaten 112 from Luke Pomersbach.
The Scorchers looked unlikely to play in the finals, let alone host the final after dropping the first two games of the competition but the Justin Langer led side has found form when it matters the most.
They won five of their next six games and finished second on the Big Bash table, hosting the superstar line-up of the Melbourne Stars.
In a rain-affected match, the Scorchers won in dramatic fashion as retired Test hero Mike Hussey hit the winning runs off the last ball of the Perth sides innings.
Power-hitting from runner-up in the BBL player of the tournament Shaun Marsh, 68 off 40 balls at the top of the order set up the victory as Hussey (21) and Adam Voges (36) anchored the innings.
The availability of Heat paceman Ben Cutting could be a huge factor in the outcome of the match, with the speedster on stand-by to play for Australia on Friday in Brisbane against Sri Lanka.
The Scorchers have their own selection worries with Marsh's opening partner Herschelle Gibbs retiring hurt in the semi-final against the Stars with a hamstring complaint and in doubt for the decider.
Big Bash Final - MATCH-UPS
Shaun Marsh v Luke Pomersbach
The two former bad boys of West Australian cricket have played up to their true potential during the second edition of the BBL.
Marsh has led the runs in the BBL with 396, followed behind by close mate Pomersbach on 360.
The two played together for years for the Western Warriors and both are key to their sides fortunes come Saturday night.
If either bowling attack can claim the opposing opener cheaply, they will go a long way to winning the final.
Dan Christian v Nathan Coulter-Nile
The all-rounders of the teams could be vying for an Australian position in the coming years and months.
With Shane Watson's future unclear and the Australian selectors wanting to experiment with all-rounders, a big performance on the big stage could catapult them into an Australian ODI or T-20 side.
Former Test batsman Marcus North recently said Coulter-Nile was ready for the Australian ODI team.
Coulter-Nile showed his versatility in the semi-final, claiming 1-24 with the ball and batting at three.
Christian has held national honours in past seasons but seems to be out of favour as of late. He has had an up and down BBL, with a high score of 49 and best bowling figures of 5-26 but several lean matches in between.
Michael Beer and Brad Hogg v Nathan Hauritz
The three former Test spinners could all play a vital role in the end result of the BBL final.
Beer and Hogg have found throughout their home matches this season that spin can claim wickets on the bouncy WACA deck.
Hauritz has only taken the one wicket during the BBL and the Heat will need a major contribution from him if they are to win on Saturday.
Hogg has had the most success of the three spinners this season with best figures of 4-29 against the Sydney Thunder.
Kemar Roach v Alfonso Thomas
The fast-bowling hired guns with the ball for either franchise have played a massive role in getting their sides to the final and could be the difference on the WACA wicket.
Thomas joined the Scorchers late in the tournament but has been their best bowler, with best figures of 4-8 against the Renegades at the WACA.
West Indian Roach has been a big winner with the Heat with his massive goal necklaces and his steep bouncers.
Roach is no stranger to the WACA ground, he famously roughed up Australian captain Ricky Ponting with a barrage of short balls in the 2009 Test match and will look to do similar to the Scorchers come Saturday.
Scorchers middle-order v Heat middle-order
The second BBL could be won and lost in each sides middle order.
The Scorchers have an enormously experienced middle order off Simon Katich, Hussey, Voges and Marcus North, all with extensive Australian experience.
The Heat bowling line-up will be hoping to claim all four cheaply and get into the Scorchers tail.
The Heat's batting list has changed regularly throughout the tournament with Peter Forrest moving up and down the order.
Joe Burns has been in good touch during the BBL, getting five solid starts but never passing 50 and with middle order partner Chris Lynn passing 50 twice, they loom as key wickets for the Scorchers bowlers.