Cunningham burst over for a trademark try from dummy-half after Paul Sculthorpe had been held up just short of the line and with Saints back in the groove, Gidley was the next to score after some tired defence from the Dragons.
And the visitors took the lead for the first time when youngster Cameron King burst through from close range after throwing a dummy from the play the ball.
Moments later, Burgess had the crowd on their feet once again when he burst through, only to opt for another dummy when a pass to Sam Tomkins would probably have been a better option.