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Here is what I remember. It was a 90's (I think, not 100% sure, but it's very likely) cartoon series with a rather serious non goofy tone about a squad that dealt with paranormal / extraterrestrial activity. They used a helicopter similar to a Chinook for transportation. I distinctly remember one episode where a cloud formed over a small town and its rainwater made everyone sick. When the squad made it high up and into the cloud they encountered Octabrain-like creatures that acted as the cloud's bio defense mechanism. I remember those things ate live missiles that were launched at them.

I'm afraid that's pretty much all I remember aside from the end credits theme being dark and moody.

Hope it rings a bell.

Here is what I remember:

It was a 90's (I think, not 100% sure, but it's very likely) cartoon series with a rather serious, non-goofy tone about a squad that dealt with paranormal / extraterrestrial activity.

They used a helicopter similar to a Chinook for transportation. 

I distinctly remember one episode where a cloud formed over a small town and its rainwater made everyone sick. When the squad made it high up and into the cloud they encountered Octabrain-like creatures that acted as the cloud's bio defense mechanism. I remember those things ate live missiles that were launched at them.

I'm afraid that's pretty much all I remember, aside from the end credits theme being dark and moody.

Hope it rings a bell.