He returns the day of the group 's first major competition , the Sectionals , to undo sabotage by cheerleading coach Sue Sylvester ( Jane Lynch ) ; the group makes up a completely new set list , which Rachel opens with a solo of `` Do n't Rain on My Parade '' , and New Directions wins by unanimous decision .
He does this to undo damage by cheerleading couch Sue Sylvester ( Jane Lynch ) .