All in the Menacing
After wrestling in the garden, Gnasher hurts his tooth, so Dennis has to take him to the vet. It is not a smooth visit, and Gnasher ends up swallowing the laughing gas canister. When trying to escape the vet, Dennis and Gnasher end up at the conference centre, where wrestling is being held.
Sneaking into one of the rooms, they disrupt Dad's work conference, but it all turns out well in the end, and they end up going to the wrestling to see Dennis's favourite wrestler. If only Gnasher would stop breaking wind and releasing laughing gas!