Man what, maybe this thread should be locked after all! Hah just messing with ya . That's a shame. It's without a doubt my favorite series so it's a bit disappointing that you're not enjoying it so far. There's a few monster themed episodes in the TV series and OVA so I can't pinpoint exactly which episode you're referencing, although I have an idea. If it's any consolation, the TV series is the best place to begin. The TV series is 51 episodes. The series strength in my opinion is the fantastic writing and atypical characters. Headgear are able to take any topic and make it interesting. The movies are more serious, with themes of just war and very GITS like in its pacing, so if that sounds more like your thing, you could start with the 7 episode OVA (Early Days OVA) and then jump straight into the Movies.
i think it was like ep 3 of the first tv series, or ep 3 of an ova series
EDIT: Yeah i watched the first 3 eps of the Early Days OVAs