The Gentleman and the Thief Slugterra : Season 2 Episode 10

Using some stolen Shadow Clan tech, Dana Por is able slip in and out of any cavern in Slugterra - and rob them blind! But when she makes the mistake of stealing from Dr. Blakk, Eli is the only one who can protect her from The Gentleman, a suave but deadly mercenary Blakk hires to take back what was stolen from him - and bring back the scalp of the girl who stole it!