Who is in the Apollo 13 original crew?

The original crew of Apollo 13 consisted of Commander Jim Lovell, Command Module Pilot John Swigert, and Lunar Module Pilot Fred Haise. Jim Lovell had previously flown on Apollo 8 and Apollo 11, while John Swigert and Fred Haise were making their first spaceflight. However, due to a change in the crew before launch, Ken Mattingly, who was initially assigned as Command Module Pilot, was replaced by Swigert after he was exposed to German measles.