Shearsmith said to Digital Spy:
“I was honoured to be part of it. I think [Mark Gatiss] just always had this idea that I would [play Troughton]. It’s very small – I’m literally only in a very small little bit, but it was lovely to be part of it.”
“Mark (Gatiss) was in his absolute element, wandering around the TARDIS… the attention to detail was immaculate. He’s done a really good rendering of that time and that story. I think it’s a real treat.”An Adventure in Space and Time is written by Mark Gatiss, and will be broadcast on BBC Two.
[Source: Doctor Who TV]