Only film they lampooned I ever saw in a theater was...
..."Laserblast" in 1978.
shareI saw This Island Earth at a movie theater but it was part of another movie called Movie Theater Movie something.
Let's see who takes the bait.
Robot Monster (saw it as a double feature with Plan 9 - good prints!)
Manos - The Hands of Fate (beat up print at a film festival)
Saw these before I ever saw any MST3K episodes.