Antibodies (also known as immunoglobulins) are Y-shaped proteins that are found in blood or other bodily fluids of vertebrates, and are used by the immune system to identify and neutralize foreign objects, such as bacteria and viruses. Antibodies are produced by the B cells, a type of white blood cell.
Unfortunately, Finchen discovers the antibodies are sleeping. The green antibody (Michael Kessler) tells Finchen that they'll need some vitamins to help them stay awake, so they can help Nils. Finchen makes them a freshly pressed glass of orange juice, and they step into action.