Catboy x Gekko (Catkko)

Catkko is the brother relationship between Catboy and Gekko.

Episode Appearances:

 * Owlette and the Flash Flip Trip
 * Catboy and the Pogo Dozer
 * Gekko and the Super Ninjalinos
 * Owlette's Terrible Pterodactyl Trouble
 * Catboy and the Shrinker
 * Owlette the Winner
 * Speak UP, Gekko!
 * Looking After Gekko
 * Catboy's Tricky Ticket
 * Gekko Saves Christmas
 * Gekko's Nice Ice Plan
 * Catboy and Gekko's Robot Rampage
 * Owlette's Feathered Friend
 * Catboy Takes Control
 * Owlette of a Kind
 * Lionel-Saurus
 * Who's Got The Owl Power?


 * Bounce-a-Tron
 * The Wolfy Kids
 * Octobella (episode)

Examples:

 * In "Catboy and the Pogo Dozer", Catboy did not let Gekko ride on the Pogo Dozer but at the end he learns that Gekko should get his turn. They also rode it together and made a "high-five".
 * In "Owlette and the Flash Flip Trip", they were tied together by Robot.
 * In "Owlette's Terrible Pterodactyl Trouble", they did a high-five.
 * In "Owlette the Winner" Catboy and Gekko compete but apologized and forgave each other.
 * In the episode "Looking After Gekko" Catboy was taking care of Gekko.
 * In the episode"Catboy and Gekko's Robot Rampage" Catboy and Gekko are pretending to be Master Fang and Kick McGee.
 * In the episode "Gekko Saves Christmas" Gekko saves Catboy from the Luna Board and rides it together.
 * In the episode "The Wolfy Kids" Catboy jumps and falls on Gekko's arm.
 * In the episode "Octobella" Catboy goes into water for saving Gekko even though he hates water.