Adam Clarke on Luke 24:18

Cleopas - The same as Alpheus, father of the Apostle James, Mar 3:18, and husband of the sister of the virgin. Joh 19:25.

Art thou only a stranger - As if he had said, What has been done it Jerusalem, within these few days, has been so public, so awful, and so universally known, that, if thou hadst been but a lodger in the city for a single night, I cannot conceive how thou couldst miss hearing of these things: indeed, thou appearest to be the only person unacquainted with them.