Torchwood (2006)

The 2005 reboot of Doctor Who was enough of a success in its first few years to allow the greenlighting of various TV spin-offs aimed at different audiences. The three spin-off series covered here all had their prosthetic effects realized by Neill Gorton's Millennium FX (with many of the same crew involved), which is why they have been grouped here; K9, the Australian kids spinoff, is not included here thanks to having been done by an entirely different effects team, being filmed in Australia and all.

The first of these spinoffs was Torchwood, a more violent and raunchy spinoff about a special government division fighting off alien nasties in Cardiff - despite this premise, the practical effects creatures were surprisingly minimal. One of the recurring alien nasties were the 'Weevils', carnivorous humanoids with large jaws, realized as an actor in a prosthetic mask that could have the jaw snap open and shut.

Another recurring alien menace were the Blowfish, humanoid fish that despite the name, resembled lionfish more than blowfish! A specially made prosthetic mask was made for when a Blowfish got their head blown open by gunfire.

Tragically, the most impressive practical effects alien in the series was barely seen on-screen at all! The third series, Children of Earth, involved the Earth's children being held hostage to the whims of the mysterious '456' aliens, the title referring to the radio wavelength they used to communicate with the human governments. The 456 were designed as a three-headed raptor-like creature, and realized on-screen as a large puppet; in the episode itself though, they are entirely hidden by a mist, for suspense reasons y'know.