I Should Have Never Gone Ziplining

Brendan puts on a heavy disguise and gives Phineas, Ferb, Adam, Isabella, Baljeet & Buford flyers about ziplining. The gang is excited to spend a day ziplining. But high in the mountains, far from their families, their trip takes a bad turn. Chances of survival are slim. All they can do is wait to be rescued. But will help come too late?

Allusions
South Park - This episode is based off the South Park episode of the same name.