Tyrel Jackson Williams (born March 16, 1997) is an American teen actor, singer and musician. He currently stars as Leo Francis Dooley in the Disney XD series, Lab Rats. Williams was previously seen in the pilot episode of Good Luck Charlie and Pair of Kings. He appeared in the made for TV movie Pants on Fire as Mikey. He also provides the voice of Finn the Mer-Boy in the Disney Junior series, Jake and the Never Land Pirates. His brother is Tyler James Williams, also an actor-singer. He will voice Presto in Future-Worm!.