Joshua's Revenge of the Revenge

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Across
  1. 4. Electronic musical genre (7)
  2. 6. The study of living creatures of all kinds (7)
  3. 8. Infamous ancient city with hanging gardens (7)
  4. 13. Planet of the Time Lords (9)
  5. 17. Solar system with 7 Earth sized planets (8, 3)
  6. 18. Process of renewal (12)
  7. 19. The tenth planet in Doctor Who and original birthplace of the Cybermen (6)
  8. 22. Capital town of Dorset (10)
  9. 24. 70s pirate radio station (5, 8)
  10. 26. Gas giant (7)
  11. 27. German word for Empire. There have been three (5)
  12. 31. Meme about a nerdy looking boy who cannot catch a break (3, 4, 5)
  13. 35. Library/museum in Oxford
  14. 37. Star pupil in Assassination Classroom (6)
  15. 38. 80s sci fi film series centered around a car (4, 2, 3, 6)
  16. 39. Capital of the Islamic Republic of Iran (6)
  17. 40. The 1971 process of British currency conversion (14)
  18. 47. Final Soviet Leader (7, 9)
  19. 48. AWOLNATION song that became a hit on Vine (3)
  20. 49. Biblical garden/Fictional planet (4)
  21. 50. The process in which someone repeats what they've heard. Internal complusion (9)
  22. 51. Hampshire/Surrey based rock band with cult following (6)
  23. 52. Form of dirt/London based musical genre (5)
  24. 53. Country in Scandinavia (6)
Down
  1. 1. SFM character, usually ends up dying (5)
  2. 2. Surrey city and purported Earth origin of Ford Prefect in Hitchhiker's Guide To The Galaxy (9)
  3. 3. My second favourite film (7,3,6,7)
  4. 5. Reverse of contentment (4)
  5. 7. Star Wars Podrace
  6. 9. Rogue One planet decimated upon Jyn's victory (6)
  7. 10. Colonial name for Sri Lanka (6)
  8. 11. A theory in quantum mechanics describing the every changing nature of the time continuum (4)
  9. 12. Confectionary (6)
  10. 14. Lincoln's final curtain (5, 7)
  11. 15. Deceased DJ. Part of the class of 2016 (3, 5, 5)
  12. 16. American senpai (6, 5)
  13. 20. British boy band (3, 9)
  14. 21. Executive capital of South Africa (8)
  15. 22. Was not what we thought it was to begin with. We were tricked (5)
  16. 23. British singer (6, 8)
  17. 25. Band who sang 'Somebody Once Told Me', now a popular meme song. (3,4)
  18. 28. Becki needs this to function (6)
  19. 29. 2011 collection of Middle East uprisings (4, 6)
  20. 30. Breaking Bad character (6, 5)
  21. 32. Community concerned with sexuality and identity (4)
  22. 33. One ancestor (11)
  23. 34. Religious verse/Shaftesbury and Bath based synth-rock band (6)
  24. 36. Sentient ape, Flash villain (7, 5)
  25. 41. Celebrity who is 'winning' (7, 5)
  26. 42. Film adapted from an autobiography (6)
  27. 43. Fifties and Sixties singer. 'A Change Is Gonna Come' and 'What A Wonderful World' fame. (3, 5)
  28. 44. Wizard (7)
  29. 45. Starman (5,5)
  30. 46. Terrible 80s Batman villain (9, 4)