On dimensional reductions of the M-9-brane

We discuss the relation of the M-9-brane with other branes via dimensional reductions, mainly focusing on their Wess-Zumino actions. It is shown that on dimensional reductions along three different directions, the Wess-Zumino action of the M-9-brane gives that of the D-8-brane, the IIA NS 9-brane, and the ``KK-8A brane'', respectively, the last two of which were obtained via dualities. So, it is concluded that the relation proposed previously is consistent from the viewpoint of worldvolume actions. We also give some comment on the relation of the "exotic" KK-8A brane with spacetime superalgebras