Kostas has appeared on Teens React and later Adults React. His first appearance was in TEENS REACT TO TWILIGHT. His first after graduating was ADULTS REACT TO #SALTBAE MEME COMPILATION.
|1||TEENS REACT TO TWILIGHT||BONUS -TEENS REACT TO TWILIGHT||Teens React||1|
|2||TEENS REACT TO BED INTRUDER||BONUS - TEENS REACT TO BED INTRUDER||Teens React||2|
|3||TEENS REACT TO BOXXY||BONUS - TEENS REACT TO BOXXY||Teens React||3|
|4||Teens React to Rick Perry's Strong||BONUS - Teens React to Rick Perry's Strong||Teens React||4|