Paradise Lost: "Nirvana" (Part One) is a Doctor Who: Sims 3 episode, that will be uploaded sometime in 2013.
- Christophe Beck
- J. Peter Robinson
- John Williams
- Norman Greenbaum - Spirit in the Sky
- Wang Chung - Everybody Have Fun Tonight
- Buggles - Video Killed the Radio Star
- This is the first episode to use commercial music since "Astray".
- The main theme from Jaws can be heard when the Kraken attacks the boat.
- Nirvana is a state of perfect happiness; an ideal or idyllic place. This refers to the 1970's Paradise Resort the Doctor and Charles find.
- This episode was originally titled "1976".
- The Master does not appear in this episode. This is the first episode he has not appeared in since he became a in regular in "Nemesis".
- This is the first episode Katarina has appeared in since "Nemesis".
- This episode is the fourth-one in a row to have no guest stars at all.
- This is the first episode not to be set in present day Earth.
- This episode begins with a recap to the events when Katarina was turned into a zombie ("Nemesis") and when the TARDIS crashed ("Siege"). This is the first episode to have a recap to a previous serial.
- Katarina's fate in the crashed TARDIS that occurred in "Siege" is finally revealed.
- The Motorcycle that the Doctor stole in "Hostage" can be seen in the entertainment room.
- Katarina has found the time to change clothes since becoming a zombie. After the opening sequence, she reverts back to the original clothes she was wearing in Enigma of the Dead.