Death-Eye Turtle Army

From Tardis Wiki, the free Doctor Who reference

The Death-Eye Turtle Army was an army of "killer turtles".

The Thirteenth Doctor, and companions Graham, Yaz and Ryan, encountered the army at some point before Yaz asked to visit her grandmother in her youth. The Doctor noted that this was a dangerous encounter, and mentioned to Graham that she had apologised profusely. (TV: Demons of the Punjab)