I am almost positive that this is Optimus Prime 
from the ORIGINAL Transformers series, but I 
cannot be sure because the suit he is wearing is 
not his original form.  It definitely looks like 
he put on some extra gear or something.

Even though I know that there are several recent 
incarnations of Transformers featuring an Optimus 
Prime (too many for me to keep up with), 
something about the artwork on this particular 
cel convinces me that it had to have come from 
the original series.

Can anyone confirm or disconfirm this for me?  
And if you could even identify the episode or 
storyline that this cel appears in, I shall 
consider you a god among Transformers fans!

Please help.  The uncertainty is killing me!