Dragon Ball Z - episode 4 - 16 May, 1989

The situation looks bleak for Goku and Piccolo, as Raditz easily deflects every attack they send his way. But Piccolo may have a way to stop the sinister Saiyan. He's perfected a powerful new attack, the Special Beam Cannon! There's only one problem: Piccolo needs time to gather the energy for the blast, which means Goku will have to last for five minutes against Raditz alone! (Source: dbzepisode.org)