Last November, the Notre Dame faithful expected the undefeated Fighting Irish to storm the Coliseum and obliterate an erratic 5-6 USC team led by a precocious freshman quarterback. The visitors narrowly averted the same disaster that had befallen other unbeaten or highly-rated Irish teams in the last century. Nearly one year later, another talented but mistake-prone group of Trojans (3-2), improbably led by yet another freshman quarterback, hope to stun ninth-ranked Notre Dame (4-1) while saving their season and quite possibly their own head coach. Saturday’s showdown will be played in South Bend and televised by NBC beginning at 7:30 PM Eastern time.