In 3001: Final Odyssey the resurrected Frank Poole goes to Europa and is allowed to land by Dave Bowman, who can sometimes overide the Monolith. Dave passes on what he knows about the Monolith and everything is happy....

If you don't want to know what happens next GOE AWAY

Later Frank learns through Dave that there is a possibility the Monolith is being sent instructions to terminate the experiment on Earth and concentrate on the Europans. The experiment in question is mankind. Frank Poole then returns to Europa again to recover the memory device Dave and Hal escaped to after helping mankind destroy the Monolith by infecting it with the most destructive computer viruses ever made.