Sisters Kat and Jo realise there's a zombie apocalypse in Birmingham, but gamer Kat has a plan: zombies can't swim - water is the safest option, and narrowboats move just marginally faster than zombies. Jo is unconvinced, until the guy she just slept with (Jude) turns into a zombie!

Meanwhile, Amar and Sunny have been in Birmingham for a stag. When all trains back to London are cancelled and they're attacked by a train guard zombie, they flee.

Kat and Jo narrowly escape zombie Jude and set sail on Dorothy (Jo's ex-boyfriend's narrowboat). Unbeknownst to them, Sunny and Amar are hidden in the boat's toilet!

Our gang arrive at the hotel where Sunny and Amar spent their stag weekend. Amar insists they check if their mates are alive. Kat makes Jo stay and guard Dorothy.

In the hotel, they realise the groomis still tied up on the roof! Sunny admits to Amar he hated the stag weekend. Amar reveals Sunny was a drunken nightmare.
Meanwhile Jo sneaks into the hotel for a shower, endangering the boat.

The others are cornered by zombies on the roof. Amar notices an escape route just in time, but their zombie fight covers clean Jo in more blood…