Goku Goes Super Saiyan 4 For Fhe First Time [Dragon Ball GT]

In what episode does Goku go Super Saiyan 4 for the first time?

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Episode Summary:

Goku manages to regress from his rampaging ape form and in the process ascends to Super Saiyan 4. After a conversation with Pan and his grandfather, Goku flies of to find find his foe. Shortly after arriving at the base of the Tuffles, the inevitable fight between Goku and Baby begins with Goku having the upper hand.

Not long after, it would seem that Baby had gotten the edge in the fight. It later turned out that Goku was fooling him just to test out the the strength of his new Super Saiyan 4 form. After suffering heavy blows, Baby manages to turn the tables after Infected Bulma gets the blutz wave generator to work. After being hit by the waves, Baby transforms into an ape and goes on a rampage.