The Slippery Slope

S5 E6: A friend from Jack's past shows up at Heartland when one of their old band mates passes away. Lou and Lisa secretly try to gather the other remaining members for a reunion performance to celebrate Jack's birthday. Meanwhile, Amy works with a horse that won't stop bucking as Caleb becomes smitten with Kelly - the horse's sassy and attractive owner. And Mallory meets a young country singer wannabe who seems like her perfect match... except for the fact that he idolizes her dad.