Season five, Episode nine – “Screech”

After the Apocalypse

A pandemic survival story

…

Some kind of animal shot out from behind the lab cages and leapt at the old man.

And then chaos!

The old man fell on his back, and rolled on the floor, with his arms up trying to protect his face and head from the frenzied attacker.

A whirlwind of vicious blows assaulted him as he rolled across the floor trying to find cover.

Someone shouted, then there were screams.

...

S5E9 - Season five, Episode nine – “Screech”