There are at least three different theme songs to
G.I. Joe, not counting the "Joes Get Tough" theme of the later episodes when the show was picked up by a different animation company. The three best known are the original theme (which is the one you find on most websites), the series theme (which is the same save two words), and the theme song from G.I.: The Movie (which is much cooler).
Original Lyrics
He'll fight for freedom!
Wherever there's trouble,
G.I. Joe is there!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
It's G.I. Joe against Cobra and Destro,
Fighting to save the day!
He never gives up!
He's always there!
Fighting for freedom over land and air!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
"G.I. Joe is the code name for America's daring highly
trained special mission force. It's purpose: to defend
human freedom against Cobra, a ruthless terrorist
organization determined to rule the world!"
He never gives up!
He'll stay 'til the fight's won!
G.I. Joe will dare!
G.I. Joe (A Real American Hero)
G.I. Joe!
Series Lyrics
He'll fight for freedom!
Wherever there's trouble,
G.I. Joe is there!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
It's G.I. Joe against Cobra the enemy,
Fighting to save the day!
He never gives up!
He's always there!
Fighting for freedom over land and air!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
"G.I. Joe is the code name for America's daring highly
trained special mission force. It's purpose: to defend
human freedom against Cobra, a ruthless terrorist
organization determined to rule the world!"
He never gives up!
He'll stay til the fight's won!
G.I. Joe will dare!
G.I. Joe (A Real American Hero)
G.I. Joe!
Movie Lyrics
Crashing through the sky, comes a fearful cry!
Cobra! Cobraaaaa!
Cobra! Cobraaaaa!
Armies of the night! Evil taking flight!
Cobra! Cobraaaaa!
Cobra! Cobraaaaa!
Nowhere to run!
Nowhere to hide!
Panic spreading far and wide!
Who can turn the tide?
G.I. Joe (A Real American Hero)
Duke: "Yo, Joe!"
G.I. Joe is there!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
Fighting for freedom wherever there's trouble,
Over land and sea and air!
G.I. Joe is there!
Can the world oppose, deadliest of foes?
Cobra! Cobraaaaa!
Cobra! Cobraaaaa!
Joes will risk it all to end the evil call,
of Cobra! Cobraaaaa!
Cobra! Cobraaaaa!
They never give up!
They never say die!
Walking tall with banners high!
They sound the battle cry!
Yo Joe! Yo Joe!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
Fighting for freedom wherever there's trouble,
Over land and sea and air!
G.I. Joe is there!
"G.I. Joe is the code name for America's daring highly
trained special mission force. It's purpose: to defend
human freedom against Cobra, a ruthless terrorist
organization determined to rule the world!"
G.I. Joe (A Real American Hero)
G.I. Joe is there!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
Fighting for freedom wherever there's trouble,
Over land and sea and air!
Cobra Commander: "Cobra! Retreat! Retreat!"
G.I. Joe is there!
G.I. Joe (A Real American Hero)
G.I. Joe is there!
G.I. Joe!