I win the award of Worst Person At Remembering Episode Titles, but it's the one battle early in season one that takes place outside of the Axalon, which Dinobot kicks off by doing that badass flying-kick and nailing Megatron square in the face. The two wind up fistfighting and I remember watching it as a kid and saying "Holy CRAP!" (In little kid-speak, of course.) I re-watched it a couple days ago and gained a new level of respect for Dinobot. Seriously, the energy and total viciousness in that scene was so awesome.

P.S. Icon LOVE.