Index image here:

1. Astroboy (Astroboy)
2. Marvin (Hitchhiker's Guide To The Galaxy (Film))
3. K-9 (Dr. Who)
4. Huey (Silent Running)
5. HAL (2001)
6. Vincent (The Black Hole)
7. Conky 2000 (Pee Wee's Playhouse)
8. Rusty the Boy Robot (Big Guy)
9. Twiki (Buck Rogers)
10. Model B-9 Environmental Control Robot (Lost in Space)
11. Crow (MST3K)
12. Number 5 (Short Circuit)
13. Martian Fighting Machine (War of the Worlds, book illustration)
14. WALL*E (WALL*E)
15. Tom Servo (MST3K)
16. Robbie the Robot (Forbidden Planet)
17. Robot Bad Guy (Video Game: Berzerk (1980))
18. Gigantor (Gigantor)
19. BomberMan? (Video Game: BomberMan)
20. Rock-Em Sock-Em Robot (toy)
21. Mecha Godzilla (Gojira tai Mekagojira)
22. MegaMan (Video Game: MegaMan)
23. Tin Woodsman (The Wizard of Oz)
24. Enforcer (Video Game: Robotron:2024)
25. Cylon (Original Battlestar Galactica)
26. Marvin (BBC TV Hitchhiker's Guide to the Galaxy)
27. Bubo (Clash of the Titans)
28. Sentinel (Matrix)
29. R2D2 (Star Wars)
30. Jet Jaguar? (Godzilla vs. Megalon)
31. Gort (The Day the Earth Stood Still)
32. Baron Karza (Micronauts)
33. Bender (Futurama)
34. Terminator (Terminator)
35. C3PO (Star Wars)
36. Giant Robot on cover of Queen's album "News of the World"
37. The Iron Giant (The Iron Giant)
38. Maria (Metropolis)
39. Centurion (new BSG)
40. Rosie (The Jetsons)
41. Optimus Prime (Transformers)
42. The Wrong Trousers (Wallace & Grommit)
43. ED-209 (Robocop)
44. Mazinger Z
45. Tachikoma (Ghost in the Shell)
46. Voltron (Voltron)
47. Droideka (Star Wars Eps 1-3)
48. Dalek (Dr. Who)
49. Dr. Theopolis (Buck Rogers)
50. Maximilian (The Black Hole)
51. Muffit (original Battlestar Galactica)

Wow, SteenkinBadgers... I think you're dead-on. Awesome call. I'd totally forgotten that album cover until you mentioned it.

Uberchet: I seriously considered #19 being Bomberman earlier, and Versh is right about the designer using some thematic symmetry. What stopped me is that every image of Bomberman I've ever seen has the small sphere at the top of his head. I get that if he angled his head right you wouldn't see it, so there's a good chance it is him. But I was also assuming he was a human in a suit instead of an ex-robot. I'm going to pencil him in with a question mark and just ask for others to confirm or offer alternatives.

Thanks!

Index image here:

1. Astroboy (Astroboy)
2. Marvin (Hitchhiker's Guide To The Galaxy (Film))
3. K-9 (Dr. Who)
4. Huey (Silent Running)
5. HAL (2001)
6. Vincent (The Black Hole)
7. Conky 2000 (Pee Wee's Playhouse)
8. Rusty the Boy Robot (Big Guy)
9. Twiki (Buck Rogers)
10. Model B-9 Environmental Control Robot (Lost in Space)
11. Crow (MST3K)
12. Number 5 (Short Circuit)
13. Martian Fighting Machine (War of the Worlds, book illustration)
14. WALL*E (WALL*E)
15. Tom Servo (MST3K)
16. Robbie the Robot (Forbidden Planet)
17. Robot Bad Guy (Video Game: Berzerk (1980))
18. Gigantor (Gigantor)
19. ?
20. Rock-Em Sock-Em Robot (toy)
21. Mecha Godzilla (Gojira tai Mekagojira)
22. MegaMan (Video Game)
23. Tin Woodsman (The Wizard of Oz)
24. Enforcer (Video Game: Robotron 2024)
25. Cylon (Original Battlestar Galactica)
26. Marvin (BBC TV Hitchhiker's Guide to the Galaxy)
27. Bubo (Clash of the Titans)
28. Sentinel (Matrix)
29. R2D2 (Star Wars)
30. Jet Jaguar? (Godzilla vs. Megalon)
31. Gort (The Day the Earth Stood Still)
32. Baron Karza (Micronauts)
33. Bender (Futurama)
34. Terminator (Terminator)
35. C3PO (Star Wars)
36. ?
37. The Iron Giant (The Iron Giant)
38. Maria (Metropolis)
39. Centurion (new BSG)
40. Rosie (The Jetsons)
41. Optimus Prime (Transformers)
42. The Wrong Trousers (Wallace & Grommit)
43. ED-209 (Robocop)
44. Mazinger Z
45. Tachikoma (Ghost in the Shell)
46. Voltron (Voltron)
47. Droideka (Star Wars Eps 1-3)
48. Dalek (Dr. Who)
49. Dr. Theopolis (Buck Rogers)
50. Maximilian (The Black Hole)
51. Muffit (original Battlestar Galactica)

ANY leads at all on #19 or #36?

My first instinct was that #24 in the index image was an Enforcer from Robotron, but at least one person disputes this.

I'm not 100% sure-- it's not pixel-for-pixel and when you're dealing with a 16x16 sprite, it's easy to have similar looking robots... but I did dig up an image of some here, so I'd welcome additional opinions. (Or obviously other suggestions of what it might be.

I suspect Stevezilla is right about #30 being Jet Jaguar, so I'll put it in the list with a question mark but would like additional confirmation.

Index image here:

1. Astroboy (Astroboy)
2. Marvin (Hitchhiker's Guide To The Galaxy (Film))
3. K-9 (Dr. Who)
4. Huey (Silent Running)
5. HAL (2001)
6. Vincent (The Black Hole)
7. Conky 2000 (Pee Wee's Playhouse)
8. Rusty the Boy Robot (Big Guy)
9. Twiki (Buck Rogers)
10. Model B-9 Environmental Control Robot (Lost in Space)
11. Crow (MST3K)
12. Number 5 (Short Circuit)
13. Martian Fighting Machine (War of the Worlds, book illustration)
14. WALL*E (WALL*E)
15. Tom Servo (MST3K)
16. Robbie the Robot (Forbidden Planet)
17. Robot Bad Guy (Video Game: Berzerk (1980))
18. Gigantor (Gigantor)
19. ?
20. Rock-Em Sock-Em Robot (toy)
21. Mecha Godzilla (Gojira tai Mekagojira)
22. MegaMan (videogame)
23. Tin Woodsman (The Wizard of Oz)
24. ?
25. Cylon (Original Battlestar Galactica)
26. Marvin (BBC TV Hitchhiker's Guide to the Galaxy)
27. Bubo (Clash of the Titans)
28. Sentinel (Matrix)
29. R2D2 (Star Wars)
30. ?
31. Gort (The Day the Earth Stood Still)
32. Baron Karza (Micronauts)
33. Bender (Futurama)
34. Terminator (Terminator)
35. C3PO (Star Wars)
36. ?
37. The Iron Giant (The Iron Giant)
38. Maria (Metropolis)
39. Centurion (new BSG)
40. Rosie (The Jetsons)
41. Optimus Prime (Transformers)
42. The Wrong Trousers (Wallace & Grommit)
43. ED-209 (Robocop)
44. Mazinger Z
45. Tachikoma (Ghost in the Shell)
46. Voltron (Voltron)
47. Droideka (Star Wars Eps 1-3)
48. Dalek (Dr. Who)
49. Dr. Theopolis (Buck Rogers)
50. Maximilian (The Black Hole)
51. Muffit (original BSG)

Awesome, thanks for the confirmations! I'll post a final listing once folks fill in the gaps and confirm the question-marks.

Not sure if there's any clever way to include an image, but I put a version of the image with index numbers for reference here.

Based on that index, here's what people have so far-- question marks for any that I can't yet confirm.

1. Astroboy
2. Marvin (Hitchhiker's Guide To The Galaxy (Recent Film))
3. K-9 (Dr. Who)
4. Huey (or Dewey or Louie... can you tell them apart?) (Silent Running)
5. HAL (2001)... probably.
6. Vincent (The Black Hole)
7. Conky 2000 (Pee Wee's Playhouse)
8. Rusty the Boy Robot (Big Guy)
9. Twiki (Buck Rogers)
10. Model B-9 Environmental Control Robot (Lost in Space)
11. Crow (MST3K)
12. Number 5 (Short Circuit)
13. War of the Worlds?
14. WAL*E
15. Tom Servo (MST3K)
16. Robbie the Robot (Forbidden Planet)
17. Robot Bad Guy (Video Game: Berzerk (1980))
18. Big Guy (Big Guy)
19. ?
20. Rock-Em Sock-Em Robot (Toy)
21. MechaGodzilla
22. MegaMan
23. Tin Woodsman (The Wizard of Oz)
24. Robot Bad Guy (Robotron)?
25. Cylon (Original BSG)
26. Marvin (BBC TV Hitchhiker's Guide to the Galaxy)
27. Bubo? (Clash of the Titans)
28. Sentinel (Matrix)
29. R2D2 (Star Wars)
30. ?
31. Gort (The Day the Earth Stood Still)
32. ?
33. Bender (Futurama)
34. Terminator (Terminator)
35. C3PO (Star Wars)
36. ?
37. The Iron Giant (The Iron Giant)
38. Maria (Metropolis)
39. Centurion? (new BSG)
40. Rosie (The Jetsons)
41. Optimus Prime (Transformers)
42. The Wrong Trousers (Wallace & Grommit)
43. ED-209 (Robocop)
44. Tranzor Z / Mazinger Z?
45. Tachikoma? (Ghost in the Shell) -- very unsure on this one
46. Voltron (Voltron)
47. Droideka (Star Wars Eps 1-3)
48. Dalek (Dr. Who)
49. Dr. Theopolis (Buck Rogers)
50. Maximilian (The Black Hole)
51. Muffit? (original BSG)

Awesome start, Mr. Pickles!

Here are the ones I recognized (roughtly in picklish order, though maybe not exactly)

1. Astroboy
2. Marvin the Paranoid Android (HHTG: The Movie)
3. K-9 (Doctor Who)
4. Huey (Silent Running)
5. Dr. Theopolis (Buck Rogers) or HAL (hard to say)
6. Vincent (Black Hole)
7. ?
8. ?
9. Twiki (Buck Rogers)
10. The Robot from Lost in Space
11. Crow (MST3K)
12. Johnny 5 / Number 5 (Short Circuit)
13. Tripod robot from "War of the Worlds" (probably) or BBC Tripods series (unlikely)
14. Wal*E
15. Tom Servo (MST3K)
16. Robby the Robot (Forbidden Planet)
17. Robot from videogame "Berzerk"
18. ?
19. Rock-em Sock-Em Robot
20. MechaGodzilla
21. MegaMan
22. Tin Woodsman (The Wizard of Oz)
23. Robot from videogame "Robotron"?
24. Cylon (old Battlestar Galactica)
25. Marvin the Paranoid Android (BBC TV series of HHGTTG)
26. ?
27. Bubo? (Clash of the Titans)
28. Sentinel (Matrix trilogy)
29. R2D2
30. ?
31. Gort (The Day the Earth Stood Still)
32. ?
33. Bender (Futurama)
34. Terminator
35. C3PO
36. ?
37. Iron Giant
38. Maria? (Metropolis)
39. ? (maybe robot from Miyazaki's Castle in the Sky?)
40. Rose the Robot (Jetsons)
41. Optimus Prime (Transformers)
42. The Wrong Trousers (Wallace & Grommit)
43. ED-209 (Robocop)
44. That huge robot tank from Ghost in the Shell?
45. The droids from Star Wars Episode 1
46. ?
47. ?
48. Maxmillian (The Black Hole)-- love taht they did him in evil-mode
49. Unsure... maybe something Gundam
50. ?
51. Dalek (Dr. Who)