Episode Title:Karate Schooled.Episode Description:The Turtles are reunited with Casey Jones and April O'Neil, who inform them that they have been missing for an entire year. Everyone tries adjusting back to the lower tech era, while Donatello begins construction on a device to enter cyberspace to retrieve the data-bits of Master Splinter. Casey has been attending a martial arts school, heading by Khan, a devoted Foot Clan operative who is recruiting and brainwashing his students to rebuild the Foot. Despite the Turtles interference, Khan's hopes are renewed when Cyber-Shredder makes contact with him from cyberspace.