Dennis & Gnasher: Unleashed! expands reach Details Michelle Clancy | 15 April 2019 Beano Studios is teaming up with production company Selladoor to create a musical stage production based on hit TV show Dennis & Gnasher: Unleashed! The family-friendly show, which is being developed by Selladoor, will launch in 2020 on a year-long tour of 40+ theatres and venues across the UK and Ireland. BAFTA-winning writer/producer-director Will Brenton is on board to write the show, which will feature Dennis and Gnasher