And I say high maintenance because there’s only a certain amount of time that the servos can operate before you risk blowing them out!' But… it’s also like having a load of very high-maintenance cast members on set. 'It was a bit of a nod to the films of the 80s and 90s I grew up with, but it was also obviously just fantastic to have real animatronics walking around,' says Tammi. More of a challenge was working with the film’s real monsters – designed and built by The Jim Henson Company to give the film a more authentic flavor.