The Sun has been reporting that Malcolm and Captain Magambo will have a spin off in the future, because Russell T Davies was so impressed by Lee Evans' and Noma Dumezweni's performances in Planet of the Dead that he apparently thinks they deserve a show. According to the Sun, he said, "They are a spin off series waiting to happen. UNIT soldiers often work best as half of a double-act, so Magambo needed a foil, though we never dreamed we’d get to cast the part so well."
Would this be a good idea? I personally think there are already enough spin offs, and another one would probably ruin their characters. Leave it to Torchwood and SJA!