Yamato -- Leading a Surprise Attack! - S2.E20

This is perhaps one of the most favoured episodes amongst Star Blazers fans.

Star Force reaches Earth's solar system and joins the EDF fleet. Captain Gideon commissions the Star Force to lead Gideon's carrier fleet in a surprise attack on the Comet Empire's own advance carrier fleet near Saturn. Thus, this episode gets its title.

Sandor and IQ-9 takes a short recon flight to Phoebus, Saturn's 10th moon, to locate the enemy's fleet. The fleet is ambushed and defeated by an Earth carrier fleet led by the Argo.

This episode features a really swinging version of the Yamato main theme (often called the "Disco Yamato Theme") played as the EDF squadrons launch.