JJ is so keen to get Dennis the new bike she thinks he's desperate to have, that she agrees to make a deal with Walter, and without realising it, passes on information that could lead to a jelly-blasting rampage.

The gang's efforts to help JJ master the ancient art of blamjitsu are ruined by Walter's plans to capture the Beanotown yeti. Dennis and the gang defend the yeti, and help JJ unleash her inner blam, in a gravity-defying blam-jitsu face-off with the WilburCorp henchbot.