Bioshock 2 (Remastered): Episode 4 - Ryan Amusements (Part 2)

We make our way out of the amusement park, just as soon as we've unlocked the security doors and picked up a nice Tonic prize. Having collected enough ADAM from our prior explorations, we return to the Gatherer's Garden to pick up the Plasmid we need to melt the ice from the train tracks. On our way back to the station, we meet up with our first truly hostile Big Sister, and are forced to combat her. That taken care of, we return to the train and head to the next level.