As the topic says, which is your most favorite episode???
you can have multiple choice.
Personally I like the 3rd and 5th one.
if you watch carefully, you'll find that 3 and 5 are partially connected.
Grafight I,II,III,IV over here
Grafight V here

Grafight v of course.

...Or Grafight 5 V2? now that's the real question http://www.fileize.com/view/769d0d9f-e48/

^^
grafight 5 v2 is just another variant of original one which terk had planned but later discarded..

simple, 5.

of course its 5. because its terk's best animation yet for grafight series.

Grafight V (the unfinished one) used to be a brand several years ago. I liked it.