Watch the Day 5 preliminaries at the Canadian swim trials in Victoria

Click on the video above at 12:30 p.m. ET to watch the Day 5 preliminaries at the Canadian swimming trials at 12:30 p.m. ET from Victoria as Canadian superstar Summer McIntosh continues her assault on the record books.

McIntosh will attempt to break her own world record in the women's 400-metre individual medley race. 

The 18-year-old from Toronto has been on a mission this week, breaking two world records and two other national records.

On Tuesday, McIntosh added yet another feather in her historic cap, winning the women's 200-metre butterfly final in a Canadian record time of two minutes, 2.26 seconds, giving her the second-best performance in the history of the event behind China's Liu Zige (2009).

"I actually think I rank this race higher than some of my other ones," McIntosh told CBC Sports' Devin Heroux after the race.

"I would almost rate it higher than the 200m IM just because I think this world record is the hardest one to get. ... Really happy with the 2:02-low. Going into tonight I didn't know if that was possible."

WATCH | McIntosh wins women's 200m butterfly final in Canadian record time:

McIntosh breaks another Canadian record this time in the 200-metre butterfly

McIntosh has also broken worlds records in the 400m freestyle and the 200m IM over the last four days. 

Summer McIntosh takes on the 200m butterfly and all the highlights from Day 4 | THE READY ROOM