experiments. He is a genetic experiment who has all the abilities of Stitch (plus a greater fluency in English). However, he is a lazy coward who prefers to make sandwiches rather than fight. Although he is now known as "Reuben", he was not given this name until Leroy & Stitch, and was referred to by his experiment number throughout The Series, although Lilo called him "Sandwich Boy" once in the episode "627". Recurring Mertle Edmonds (voiced by Liliana Mumy) is Lilo's classmate and rival. She appeared in many episodes of the series, usually causing conflicts for the title duo in the episodes she appeared in. David Kawena (voiced by Dee Bradley Baker) is Nani's boyfriend who is a local surfer and fire performer, and is aware of the existence of aliens. He appeared in "Richter", "Cannonball", "Yin-Yang", "Splodyhead", "Fibber", "Amnesio", "Poxy", "Hunkahunka", and "Wishy-Washy". X-624/Angel (voiced by Tara Strong) is Stitch's main love interest. Angel is a pink female experiment who was designed to turn the good experiments evil with a siren song. She was caught by Gantu at the end of her episode and was later rescued in "Snafu". She only appeared in those two episodes along with a cameo in "Remmy". X-007/Gigi (voiced by Tress MacNeille) is Mertle's pet. Gigi is a Shih-Tzu like experiment and her "one true place" is with Mertle as her pet. She first appeared in "Yapper" (which focused on her and is named after the nickname Lilo gave her) and later appeared in "Amnesio" and "PJ". X-221/Sparky (voiced by Frank Welker) is the first of Stitch's cousins that Stitch met. Sparky is a yellow experiment designed to create electric energy. His place where he truly belongs is in the old lighthouse to utilize his electric skills to generate light. He appeared in "Elastico", "The Asteroid", "Angel", "Skip", "Checkers", "Ploot", "Remmy", and "Snafu". Cobra Bubbles (voiced by Kevin Michael Richardson) is a mysterious government agent who is working as a social worker and the only known human aside from Lilo's family who is aware of the aliens and experiments. He appeared in "Amnesio", "The Asteroid", and "Shush", while the title experiment of the episode "Spooky" (Experiment 300) changed into Bubbles to trick and frighten Nani (Ving Rhames, who played Cobra in the original film and Stitch! The Movie, was also credited in this episode alongside Richardson). Elena (voiced by Jillian Henry), Teresa (voiced by