Greenpeace

Public Service Announcements aren't commonplace in comic books, but an interlude from Defenders #75 read like a PSA for Greenpeace.

While walking along the shore of Long Island, Hulk spotted a beached whale. Muttering that he wanted to be left alone, the green goliath pulled the marooned animal back into the water, where it swam away safely. A footnote at the bottom of two panels contained the following message about Greanpeace, plus the organization's mailing address at the time.

*IF YOU WANT TO HELP THE WHALES, TOO   WRITE: GREANPEACE

That same whale later rescued Bruce Banner when he fell overboard a ship in Defenders #88. Dr. Banner suspected that the whale sensed that he and the Hulk were the same person and was responding perhaps out of gratitude.

The Defenders. Vol. 1. No. 88. October 1980. "Lord of the Whales." Ed Hannigan (writer), Don Perlin and Pablo Marcos (artists), Joe Rosen (letterer), George Roussos (colorist), Al Milgrom (editor), Jim Shooter (leader of the pack).