I get that this was an educational piece, but it's handled so badly. The plot, such as it is, is useless, and Sarah comes off as a whiny, screaming idiot. The enemy is even more inexplicable and unbelievable than the Pescatons. This would have been better if it had abandoned the Doctor vs. monster format of the show and just been the Doctor taking Sarah on a tour through time.

Exploration earth is a fun little story, made as an educational piece to be played in schools. The plot is overly complicated, but it is fun to hear Tom Baker and Elizabeth Sladen work together again. An oddity that is worth checking out.