Eric Cartman has turned invisible only in a South Park episode
In the episode 'Good Times with Weapons', Eric Cartman (in anime style) turns invisible.
(
Anthonyb3ta70100,
Wed 2 Mar 2016, 18:51,
archived)
He is not invisible, he is opaque.
Invisible is so February 2016. Opaque is where it's at now, daddyo.
(
monkeon schmonkeon,
Wed 2 Mar 2016, 19:27,
archived)