Originally, BioShock Infinite was to feature enemies called the "Vigor Junkies", who were much similar to Rapture's Splicers, being heavily mutated from the use of Vigors. Concept art can be seen in The Art of BioShock Infinite and a model was made for one of the variants, which was resued for the Frosty Splicer in Burial at Sea.
Main article: Burial at Sea - Episode 1. Shock Jockey makes a return as a drinkable Plasmid in the BioShock Infinite downloadable content Burial at Sea - Episode 1. Since Shock Jockey functions the same as the Electro Bolt Plasmid, it can also be cast on short-circuited switches to unlock doors just like in BioShock and BioShock 2. Best Feature: It implemented new weapons, Gears, and gameplay mechanics, which is impressive for a 2 hour DLC. BioShock Infinite: Burial at Sea - Episode 1 is the first of two story-driven DLC's BioShock Infinite: Burial at Sea - Episode 1. Come back to Rapture in a story that brings Booker and Elizabeth to the underwater city on the eve of its fall from grace. Developed by Irrational Games, the studio behind the original BioShock and BioShock Infinite, this DLC features Rapture as you’ve never seen it before—a shining jewel at the vOeijm.