I realise this is not the right time of year for posting this, but I came across this yesterday and the notion of Javier Grillo-Marxuach bringing The Middleman and the Doctor together was just too delicious to keep to myself just because it's not Xmas again just yet:
[...] By the time The Middleman fired his grappling gun and was halfway through his arc over the ball of light and dread where the salt-and-pepper-shaker dudes had once stood - hoping to make the final, desperate act of his life the simultaneous rescue of his sidekick and dropping of a Hydrogen Atomizing, Incendiary Load, Multi-Armament-Radiating Ypsillon (so named for it's Y-shaped form-factor) into the opening maw of the Cinderellica, the fate of the world had already been signed, sealed and delivered.
The Middleman's final desperate act of self-sacrifice was to have been in vain.
Had he not heard - over the clamor of exploding cyborgs and henchmen - an aural phenomenon he had many years ago vowed to never forget... an echoing, pulsating mechanical howl best described as the animal husbanding of the arooga-horn from a Ford Model-A and a 1930's Parisian hotel elevator inside one of the vacuum tubes of the BBC Radiophonic Workshop circa 1963.
By the time The Middleman's swashbuckling trajectory had taken him to the spot where Wendy Watson hanged unconscious - but before he was able to flip the switch arming the Hydrogen Atomizing, Incendiary Load, Multi-Armament-Radiating Ypsillon - both he and his sidekick were in a different place altogether.
Inside the cobalt blue police call box which had inexplicably materialized over the late Kanimang Kang's Coliseum-like lair and briefly hovered in space before vanishing with a final echoing AROOGA-THUMP!
Say what you will about the Doctor, s/he knows how to make an entrance.
[Via Grillo-Marxuach Design Bureau, via somewhere else I forgot to keep a note of at the time]