Hugh Bowman has no doubt Temple Of Boom can become the first horse in more than three decades to win the Galaxy twice - on one condition.
"It needs to be dead or worse for him to win at this level but if he gets that rain-affected ground he's the one they want to look out for," Bowman said.
The last dual winner of the sprint was Grey Receiver who went back-to-back in 1981-82.
Temple Of Boom gave trainer Tony Gollan his first elite victory in the corresponding race two years ago when it was staged at Randwick but the seven-year-old has not won since.
Bowman has ridden the horse sporadically throughout his career and was aboard for his most recent run in the Challenge Stakes.
In a bunched finish, Temple Of Boom was eighth to Villa Verde but his effort to be beaten just 1-3/4 length gives Bowman confidence going into Saturday's race at Rosehill.
"His run was really good in the Challenge and he's going to appreciate the 1100 (metres)," Bowman said.
"He ran really well, he travelled nicely but he just wasn't sharp enough over the 1000 metres."
Gollan will be looking for his second elite win in eight days after Temple Of Boom's half-brother Spirit Of Boom broke his Group One maiden with a William Reid Stakes victory on Friday night.
The Galaxy has attracted a final field of 14 including Bel Sprinter who like Temple Of Boom will be striving to win the race for a second time.
Snitzerland was runner-up 12 months ago and will get her chance to go one better on Saturday when she also meets her last-start Challenge Stakes conqueror Villa Verde.
Trainer Joe Pride will have three runners led by Rain Affair who has been out-of-form in two starts this preparation but has a near-perfect record in slow and heavy ground.