Question: The captain of the first Icarus is insane, burned worse than Freddy Krueger, and his crew has been dead conceivably for 7 years. How is he even alive still without medical care, let alone able to attack and murder members of the second Icarus crew? Insanity doesn't bar one from infection or organ failure.
Answer: It is implied that Pinbacker's dedication to his mission to destroy humanity allows him to ignore his injuries. It must also be pointed out that Pinbacker was intentionally designed by director Danny Boyle to break the "realism" of the film. His survival is intended to be almost supernatural. Note that there is no possible way Pinbacker could have made it from Icarus I to Icarus II, but he does somehow and it's never explained.
Answer: Actually, there is a perfectly logical explanation for Pinbacker being on the Icarus II: he went through the airlock while the team was searching the ship and sabotaged the connection from there.
Friso94
Wouldn't the Icarus II immediately sense his presence though? As soon as Capa and Mace reach the airlock, the ship acknowledges that they are there.
Phaneron ★