Dennis is the Beach Boy’s charismatic drummer.

Charles Watson picked him up hitchhiking on Sunset (his Rolls was in the shop). The two hit it off, and Dennis invites Watson to a party at his home…

It was during wild parties at Wilson’s that the Manson Family mingled with the rich and famous, and the collision course of the two was set.

Later, it is Wilson and the Beach Boys cover version of Charlie’s song “Cease to Exist” that sends Manson into a psychotic rage.