Favorite childhood theme?

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I'd say Classic Space, except I wasn't around at the time

For me it would probably be Adventurers, for some reason I really loved the theme and made several stop-action videos entitled "The Adventures of the Adventurers..." Dunno what I was thinking with the name

Other than that, the favorite theme I enjoy collecting but never got around to buying as a kid is Blacktron...

How did I forget that...????

Outside of Bionicle, if we're choosing plain System sets then they were certainly lesser at that time, but I guess it could be something like Jack Stone X-Pod. I used to love that when I was younger, even though we only had two of them.

[Norton74]

12V train sets. My favorite was the #7740 TEE (Trans Europe Express)

[Drock]

Castle, from mid 80s to early 90s. My favorites were the Forestmen, but my all time favorite castle was the Black Monarch's Castle. =D

[midelburgo]

Let me think...

¿What themes were there in the 70s?

....

Ok I will say "Legoland", including 4.5v train.

[Calanon]

Rock Raiders for sure! Still one of my favourites.

[TeufelHund]

I had a lot of Classic Space sets (with the Red and White spacemen) but even though I only had the one small Castle set (Knight's Procession) I remember endlessly building castles to set the minifigs up in, so I gotta go with Castle.

[syy89]

Technic. Got back into Lego after going through a ten year long dark age and it's still Technic. :)

[Niku]

Castle... ironically never had one castle set as a kid, but I loved to see the catalogs.

I had to pretend my cowboys and fort legoredo as knigts and fortress. xD