Yeah Cobra Commander! It's from episode 15 "A Plague of Insecticons" Which is the most common episode to find cels of. Aside from perhaps the G1 Movie.
Here is a link to the exact frame on Youtube:
https://youtu.be/mYxwIeb9W9k?t=309
Or,
5:08 if you want to freeze frame. If you go to the gear icon and slow the video to 0.25 speed it's quite easy to catch the single frame.
