M&S Superhero Colin the Caterpillar Cake Our signature Colin the Caterpillar cake has had a makeover for Father’s Day. This caterpillar-shaped creamy chocolate sponge roll is filled with smooth chocolate buttercream and is covered in a milk chocolate shell. It has a decorative face and feet made of white chocolate and finished with an edible cake, to make Colin look like a superhero. Serves 5. Don’t forget to check the base of the box for a Team Colin superhero mask. Simply cut out the mask, personalise it by gluing on the extra elements, then attach elastic or string through the holes to fit.