Abstract: Disclosed are ligands comprising a first polypeptide domain having a binding site with binding specificity for a first cell surface target and a second polypeptide domain having a binding site for a second cell surface target, wherein each target are different and on the same cell. In some embodiments, the ligands described further comprise a toxin. In other embodiments, the ligands further comprise half-life extending moieties. Also disclosed are methods of using these ligands. In particular, the use of these ligands for cancer therapy is described.