Monopod

Monopods were a type of creature. A few species had binary vascular systems. (NA: Tragedy Day)

Monopods were also native to the planet Lelex. These ones were encountered by Captain Cook. (DW: The Greatest Show in the Galaxy)

Helping All Life Forms had monopod members. (EDA: Kursaal)

Behind the scenes

 * Monopods (also sciapods, skiapods, skiapodes, Monocoli) are mythological dwarf-like creatures with a single, large foot extending from one thick leg centered in the middle of their body.