Back to the Past

The Samurai Jack Theme is the theme song for the animated series Samurai Jack. It was performed by Will.i.am.

The song appears in the intro sequence of every episode (apart from the first episode and the fifth season), and appears in every episode during the end credits.

Opening monologue (Aku)
In the first four seasons, Aku starts narrating a monologue before the actual theme song plays.

Long ago in a distant land, I, Aku, the shape-shifting Master of Darkness, unleashed an unspeakable evil! But a foolish samurai warrior wielding a magic sword stepped forth to oppose me.

Before the final blow was struck, I tore open a portal in time, and flung him into the future, where my evil is law!

Now the fool seeks to return to the past, and undo the future that is Aku!

Opening monologue (Jack)
In Season 5, Jack narrates a monologue instead of Aku. The theme song itself is omitted from the intro, but still plays in the outro.

''Fifty years have passed, but... I do not age. Time has lost its effect on me.'' ''Yet, the suffering continues. Aku's grasp chokes the past, present... and future. Hope is lost.''

''Got to get back — back to the past... Samurai Jack.''

Opening monologue (Ashi Uzumaki)
In Mega Man ZX Shippuden, Ashi Uzumaki narrates a monologue instead of Aku or Jack.

Nine thousand years ago in a distant land, after Aku defeat, Kaguya Ōtsutsuki; Raimei Ōtsutsuki's older sister, has unleashed her unparalleled empire. But her children wielding magic weapons stepped forth to oppose her.

After Kaguya was sealed away, she tore open a portal in time, and flung to the present in my birth, where the Galactic Empire has risen to power and brought evil to the universe.

Now, the the suffering continues and my tribe has to undo the evil before it spreads to other worlds.

Main theme song (Will.i.am)
This song plays immediately after Aku's monologue, but not Jack's. It also plays again during the end credits.

Gotta get back, back to the past, Samurai Jack! Watch out! Gotta get back, back to the past, Samurai Jack!

Jack, Jack, Jack, Jack, Jack!

(Repeats)