Totally Mystery Much? is a crossover special and the fourteenth episode of Season 5 in the Totally Spies series.
Scientists make a startling discovery in the Antarctic--a Yeti-like snow creature frozen in a block of ice! Meanwhile, Jerry informs Sam, Clover and Alex that there have been reports of a strange being terrorizing a posh ski resort. When they arrive to investigate the luxurious place, they find that they aren't the only ones on the case - they meet Martin Mystery, a teenage paranormal investigator working for The Center – an organization much like WOOHP! In the b-story, Clover is annoyed because the nerds get a crush on her, Sam discovers she looks like Martin's sister, Diana, and Alex falls for Martin.
- Turbo Bungee
- Slime Scan
- This is a crossover between "Totally Spies!" and "Martin Mystery".
- This is the first official Martin Mystery appearance in "Totally Spies!". A character resembling him appeared in the episode "Super Agent Much?", although he only made a cameo appearance as a student along with characters resembling Diana, Marvin and Jenni. In his previous appearance, Martin does not wear his trademark jacket.
- Despite being a crossover, Martin and M.O.M. are the only characters from the original series that appear in this episode.