Doc and Thurman are siblings in the film Escape from Planet Earth .
Gary is placed in a cell hall with three alien genius siblings consisting of eldest Doc ( voiced by Craig Robinson ) , middle child Io ( voiced by Jane Lynch ) , and young Thurman ( voiced by George Lopez ) who tell Gary that various human technology has been invented by them for Shanker to rip off and sell to all of Earth so he will release them from Area 51 .
Escape from Planet Earth