FULL BACK PAUL REILLY regarded by St Helens coach Ian Millward as a major attacking threat to his side.
WINGER HEFIN O'HARE will be looking to make his third appearance in Cardiff after playing twice for Wales at the Millennium.
CENTRE CHRIS NERO has made an immediate impact at the Giants since arriving from top Australian club St George.
STAND-OFF STANLEY GENE is looking to shrug off a calf injury and inspire his side to a famous triumph.
SCRUM HALF PAUL MARCH has been one of the star Giants this season and will be looking for another massive game.
PROP MICK SLICKER is in the form of his life for the Giants and will relish the big battle with the Saints pack.
HOOKER DARREN TURNER is eyeing another major upset after his Challenge Cup final exploits with Sheffield Eagles in 1998.
SECOND-ROWER BEN ROARTY won an Australian Grand Final with Melbourne Storm and always relishes the big battles.
LOOSE-FORWARD BRANDON COSTIN is the man the Giants will look towards to inspire a semi-final charge.
SUBSTITUTE SEAN PENKYWICZ has proved an instant hit with his dummy-half darts which have set up numerous tries.
SUBSTITUTE STUART DONLAN has been a star for Lancashire in the Origin match and could be a star this weekend.
CENTRE JULIAN BAILEY has played in semi-final football at Newcastle Knights and, in his current rich vein of form, will relish playing in a Challenge Cup semi-final.
WINGER MARCUS ST HILAIRE has tasted Challenge Cup final glory with Leeds and would dearly love to repeat the act with his hometown club.
PROP DARREN FLEARY will lead the Giants into action tomorrow, having already appeared in two Challenge Cup finals and Grand Final with Leeds Rhinos.
SECOND-ROWER STUART JONES may be on a season's loan from St Helens, but that won't stop him doing everything he can to get the Giants to Cardiff.
SUBSTITUTE JIM GANNON is now getting back to his best after missing the start of the season through injury and will stand no nonsense from the St Helens forwards.
SUBSTITUTE EORL CRABTREE has been making massive impacts from the bench and will inject new life into the Giants if they start to find the going tough.
PAUL WELLENS Homegrown ace capped by Great Britain. Known as Mr Versatile after turning out at full-back and in midfield. Showed his toughness by playing most of the 2001 World Club Challenge with a fractured eye socket.
DARREN ALBERT The Blonde Bomber is now in his third season at Saints. The Aussie flyer has played State of Origin rugby for New South Wales and turned out for Newcastle Knights when they were coached by ex-Giants chief Mal Reilly.
MARTIN GLEESON The former Huddersfield player faces a major test of character after newspaper accusations of his involvement in the big RL betting scandal. Wigan-born, he has played for Great Britain. Joined Saints in 2002.
WILLIE TALAU Kiwi international who answered a Saints SOS when Darren Britt was injured last season. The Canterbury Bulldogs centre had agreed to move to Knowsley Road for this campaign, and the switch was brought forward.
ADE GARDNER An exciting Cumbrian capture. Joined from Barrow in October 2001. One of three RL-playing brothers (Jean-Paul was at Warrington and Matthew plays for Leeds). Has Great Britain Academy honours.
JASON HOOPER Australian half-back who was at St George Illawarra. Played with a knee problem last term and had surgery in the close-season. Has been hailed by coach Ian Millward for his bright form so far this campaign.
SEAN LONG There's no doubting the ability of the goal-kicking Great Britain star scrum half, but like Gleeson, will have to operate in the spotlight after last week's betting scandal accusations. Has played for Wigan and Widnes.
NICK FOZZARD The big prop needs little introduction to long-standing Giants supporters after his stint at the McAlpine. Joined Huddersfield from Leeds in 1997 and moved to Warrington in 2002. Lives in Longwood.
KEIRON CUNNINGHAM Local product rated by many as the world's best hooker. The Great Britain star has been hit by injuries but is hoping for a problem-free season. One of 10 children, his eldest brother Eddie played for Saints and Great Britain.
KEITH MASON Young prop who, like many other talented Super League operators, learned his trade at Wakefield Trinity. Dewsbury-born, he joined Saints after an unsuccessful spell in Australia with Melbourne Storm.
MARK EDMONDSON This strong-running second row was snapped up from rugby union club Vale of Lune, who were among Huddersfield's opponents in North I this season. Joined Saints in 1997, made his debut two years later.
LEE GILMOUR Great Britain international who was a big close-season capture from arch-rivals Wigan. Slick handling skills mean he can also turn out in the threequarters if needed. RL's Young Player of the Year in 1998.
PAUL SCULTHORPE Yet another Great Britain cap and to many, the best player at Knowsley Road. Has operated in both the forwards and backs since joining for £370,000 from Warrington in 1997, but happiest with No13 on his back.
SUBSTITUTES Maurie Fa'asavalu, Ricky Bibey, Mick Higham, Ian Hardman.