Ex Northern Guilford star Keenan Allen introduced himself to Cal football fans Saturday to the sound of 58,040 jaws dropping. By now you’ve probably seen the highlights.

There was the 17-yard gain on a lateral on the Bears’ first touchdown drive. There was the 18-yard reception that kicked off their second touchdown drive. The end-around that was supposed to be a wide receiver pass was special — seeing his intended target covered, Allen wove diagonally across the field for an 18-yard touchdown.

By the time Allen caught quarterback Kevin Riley’s short pass early in the second half, you half expected what came next. Allen moved left to right, picking up blockers, outrunning defenders and turning an innocent-looking play into a 48-yard touchdown.

In short, Allen made a spectacle of himself during Cal’s 52-3 pantsing of UC Davis, revealing himself to be the big play ingredient Jeff Tedford’s offense has been missing the past two seasons. Allen, a true freshman, rushed three times for 38 yards, caught four passes for 120 yards and scored twice.