Watch The Trap Door (1984) full episodes.
Synopsis: 3D plasticine animation, featuring Berk, a blue creature who lives as servant to the unseen ‘Thing Upstairs’ in an old dark house. Every time the trap door opens a new adventure begins for Berk and his pals; Boni (a talking skull) and Drutt (a mischievous spider)!
Creators: Terry Brain, Charlie Mills
Star: William Rushton
More infor: IMDB, Wikipedia