Episodes you have and have yet to see

I watched several as a little kid, but I'll count the ones I've seen as the ones I know I've watched as an adult and can remember having watched.

Have seen

Season 1
01 "Ghosts R Us"
02 "Killerwatt"
03 "Mrs. Roger's Neighborhood"
04 "Slimer, Come Home"
06 "The Boogieman Cometh"
07 "Mr. Sandman, Dream Me a Dream"
08 "When Halloween Was Forever"
09 "Look Homeward, Ray"
10 "Take Two"
11 "Citizen Ghost"
13 "Xmas Marks the Spot"
Season 2
01 "Knock, Knock"
07 "Adventures in Slime and Space"
19 "Ragnarok and Roll"
21 "Banshee Bake a Cherry Pie?"
27 "The Man Who Never Reached Home"
28 "The Collect Call of Cathulhu"
31 "The Thing in Mrs. Faversham's Attic"
33 "Lights! Camera! Haunting!"
45 "The Ghostbusters in Paris"
54 "I Am the City"
61 "Captain Steel Saves the Day"
64 "Dairy Farm"
Season 3
09 "The Grundel"
Season 4
01 "The Joke's on Ray"
02 "Flip Side"
05 "Robo-Buster"
Season 5
06 "Partners in Slime"
12 "The Halloween Door"
13 "Jailbusters"
Season 6
Season 7
04 "20,000 Leagues Under the Street"
Slimer