john, paul, ringo... who the fuck is that fourth guy?

beatles who the fuck is this guy

i know who john lennon is – is the girly guy who married a so and so japanese artist and was good with social change marketing.

i know who paul mccartney guy – he did that song with michael jackson and married a super sexy girl with one leg.

i definitely know who ringo starr is – the coolest of all – the voice behind that trains cartoon.

but who the fuck is that fourth guy?

and where did that guy come from?