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I am trying to create a list of the key episodes of smallville. These are the episodes most important to advancing the plot. Should I add or subtract any Episodes from this list?

Season 1
1. Pilot
4. X-Ray (X-Ray Vision)
6. Hourglass (Clark and Lex prophecy)
12. Leech (Clark's Powers Stolen)
21. Tempest (1)

Season 2
22. Vortex (2)
23. Heat (Heat Vision)
24. Duplicity (Space Ship)
25. Red (Red Kryptonite)
38. Rosetta (Christopher Reeve)
43. Calling (1)
44. Exodus (2)

Season 3
45. Exile (1)
46. Phoenix (2)
50. Relic
54. Whisper (Super Hearing)
58. Obsession (Powers)
61. Legacy (Christopher Reeve)
65. Forsaken (1)
66. Covenant (2)

Season 4
67. Crusade
71. Run (Flash)
77. Unsafe
78. Pariah
81. Sacred
83. Onyx
88. Commencement

Season 5
89. Arrival
92. Aqua
95. Splinter (Silver Kryptonite)
96. Solitude (Braniac)
100. Reckoning
103. Cyborg (Cyborg)
109. Oracle
110. Vessel

Season 6
111. Zod
112. Sneeze (Super Breath)
114. Arrow (Green Arrow)
116. Fallout (Raya)
117. Rage (Venom)

I know that the entire episode isn't important, but the Lex scenes related to level 33.1 in Subterranean (especially the badass final scene) are important. Also, make sure to put Justice on the list when it comes out!

Can you tell me which episodes those were?

I don't think leech is an importent episode. It (Clark getting his powers stolen) actually happens again in belreve whene Clark went to visit Lex.

I also think that oracle was an importent one. Specially at the end whene Lex cuts himself and it heals with a substance that looks like the metal that Braniac is made of.