On 25 April 2015, Garrett launched a spin-off edutainment YouTube series in collaboration with Maker Studios.^[12] The series, Wonder Quest, is scripted, professionally produced, and designed so that it can be used in classrooms.^[15] In July 2015, he appeared on the series premiere of the Disney XD sitcom Gamer's Guide to Pretty Much Everything, where he portrayed the announcer Stampy Cat at the World Gaming Championships.^[19][20] He was a featured panelist at MineCon in July 2015, held in London.^[21][22][23]

Garrett has signed a two-book deal with Egmont Publishing. Stampy's Lovely Book was released on 22 October 2015; aimed at ages 4 to 10, it features games, activities, jokes and facts about Stampy Cat and some of his friends.^[24] Stampy Cat: Stick with Stampy! was released on 28 July 2016; the 32 paged paperback features sticker-based activities, games, jokes and posters.^[25][26]