As Marshall, Gilbert and Amy are preparing for her father’s Spooktacular Halloween-themed wedding to his fiancé Carl, plans go awry when they discover that their mummy friend Harold and his beloved Rose may be in danger.

Dora, a girl who has spent most of her life exploring the jungle with her parents, now must navigate her most dangerous adventure yet: high school. Always the explorer, Dora quickly finds herself leading Boots (her best friend, a monkey), Diego, and a rag tag group of teens on an adventure to save her parents and solve the impossible mystery behind a lost Inca civilization.