Transformers:
G1 Transformers Opening Sequence Files




Here's the site where you can get all the original 1980's opening sequence videos:

Transformers Archive: Transformers Series (U.S.) Video Files

Listings:
Season 1:
"Opening credits: (People have told me that it is from Season one) - (910KB -- 0:29) transfms.mpg"

2nd Season 2:
"Opening credits: Second Version - (1.17MB -- 0:32) lw_tran2.mpg"

Season 3 (Five Faces of Darkness):
"Opening credits: Five Faces Of Darkness - (2.32MB -- 0:30) ffod-int.mpg"

Season 3:
"Opening credits: Third Season - (2.30MB -- 0:30) intro3.mpg"

Season 4 (Rebirth):
"Opening credits: Rebirth - (2.26MB -- 0:30) intro4.mpg"