Okay. Here goes. The comics, the TV episodes, and even the Slimer comics are spread evenly throughout the years, with the comics not taking into account continued stories. I did still move some stuff based on other dating conventions: "Partners In Slime" still takes place near the end of 1989 (because it's near Janine's birthday) and "The Halloween Door" and RGB#17 are still close together right after that (Janine's birthday is October 28)
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1988--Year Six
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Not a lot that would need to be changed, unless you want to move #1 and #2 out of 1988 entirely. If so, I'd put those before "Trancendental Tourist"
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1989--Year Seven
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"Trancendental Tourist" (501)
RGB#3
"Something's Going Around" (502)
RGB#4
"Changing Faces" (503)
RGB#5
"Elementary, My Dear Winston" (504)
RGB#6
"Slimer's Curse" (505)
RGB#7
"Till Death Do Us Part" (507)
RGB#8
"Three Men And An Egon" (508)
RGB#9
Slimer #1
"KItty Cornered" (509)
RGB#10
Slimer #2
"If I Was A Witch Man" (510)
RGB#11
Slimer #3
"It's About Time" (511)
RGB#12
Slimer #4
"Jail Busters" (513)
RGB#13
Slimer #5
"Surely You Joust" (514)
RGB#14
Slimer #6
"Future Tense" (515)
RGB#15
Slimer #7
Venk-Man!" (516)
RGB#16
"Loose Screws" (517)
Slimer #8
"Partners In Slime" (506)
--Moved to October, because that's when Janine's birthday is
RGB#17
--intentionally placed before "The Halloween Door" because it has Samhain in it
"The Halloween Door" (512)
--Moved to the end of October for obvious reasons
Slimer #9
"The Ghostbusters Live From Al Capone's Tomb!"(518)
RGB#18
"Revenge of the Ghostmaster"(RGB-519)
Slimer #10
"Slimer Streak"(RGB-520)
RGB#19
"The Ransom of Greenspud"(RGB-521)
Slimer #11
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1990--Year Eight
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"Janine, You've Changed"(601)
"You Can't Teach an Old Demon New Tricks"(602)
RGB#20
"The Haunting of Heck House"(603)
Slimer #12
"Ghostworld"(604)
RGB#21
Slimer #13
"Mean Green Teen Machine"(605)
RGB#22
Slimer #14
"Space Busters"(606)
RGB#23
Slimer #15
"My Left Fang"(607)
RGB#24
"Russian About"(608)
Slimer #16
"The Slob"(609)
RGB#25
"Deja Boo"(610)
Slimer #17
"Afterlife In the Fast Lane"(611)
RGB#26
"Guess What's Coming to Dinner"(612)
Slimer #18
"Stay Tooned" (613)
RGB#27
"Very Beast Friend"(614)
Slimer #19
"Busters in Toyland"(615)
RGB#28
"The Magnificent Five"(616)
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1991--Year Nine
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RGB v2#0
"The Treasure of the Sierra Tamale"(701)
RGB v2#1
"Not Now, Slimer"(702)
RGB v2#2
"Attack of the B-Movie Monsters"(703)
RGB v2#3
"20,000 Leagues Under the Street"(704)
RGB v2#4
RGB Annual #1
RGB 3-D Annual #1
3-D Slimer Special
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As interesting an exercise as this was, I still don't understand why you wanted this, I'll admit.