 The chief scientist, Mr. Trotter (Julian Holloway), and his boss, Mr. Becket (Richard Vernon), decide to exploit this discovery for their own ends, but Sammy and Marvin escape with the shirt, which enables Sammy to jump over the high factory wall, to stop the crooks car with one hand, and to run down the road like a rocket.After a number of narrow escapes, Sammy gets to the sports ground, but is tripped at the start of the race by the two bullies.With the aid of the super T-shirt, he succeeds in forging ahead, but as Marvin arrives at the ground, Sammy falters and is brought to a halt by the now volatile T-shirt.