A photoinduced, three-component radical (4+2)-cyclization-allylation reaction between 3-(2-iodoethyl) indoles, acceptor-substituted alkenes, and allyl zirconocenes of the structure Cp2ZrCl(sigma-allyl) was developed. The protocol leads to highly functionalized hexahydro-carbazoles in a single step, establishing three C-C bonds and three contiguous stereocenters at once. The radical reaction is initiated by direct photolysis of allyl zirconocenes to generate free allyl radicals.