Re: Last Classic Who Story you watched
Their heads look different in just about every story, I believe.
Yep. Best explained by saying that, while they're a clone species, each 'regiment' was cloned from a different original, pre-cloning Sontaran. Their equivalents of Ike, Monty, Storming Norman, etc, probably.
"Some days are better than others. They say that where I come from."
"Loudly, I imagine, on the day you left."
(Blake's 7 - Rumours of Death)