The Canucks looked like they were taking control early, getting two unanswered goals in the first period, but Calgary got even at 2-2 in the second.
Vancouver got the lead back and took a 4-2 lead into the second intermission, but Calgary tied it at 4-4 with two quick goals early in the third -- and then went up by one goal with 4:47 left to play.
Ryan Kesler scored a little more than a minute later to tie it at 5-5 and create overtime.
Calgary was 1-for-6 on the power. Vancouver scored once in four extra-man chances.