Sam Littlefield is set to join The CW's Batwoman. 1 / 8
He will play a character named Mouse. 2 / 8
Mouse will be part of Alice's Wonderland Gang. 3 / 8
Alice is played by Rachel Skarsten. 4 / 8
She will be Season 1's main antagonist. 5 / 8
Littlefield has appeared on The Leftovers, Sharp Objects and NCIS. 6 / 8
Batwoman was written by Caroline Dries. 7 / 8
The series will premiere on Sunday, Oct. 6. 8 / 8