Nature Calls Transformers: Animated : Season 1 Episode 14

While camping in the woods, Prowl, Bumblebee, and Sari end up discovering Cybertronian energy readings in the forest. It gets worse when they have a run-in with parasitic Space Barnacles, that have apparently taken over the Cybertronian body of their thought-to-have-been deceased enemy Megatron, and end up taking over Prowl and Bumblebee. Sari uses hot water to destroy the space barnacles, but Isaac Sumdac finds the body and takes it back to his lab to rebuild it.