The age-old conspiracy theory of visitors from a distant planet surfaces in Rusty’s latest adventure. Online sources claimed that an extraterrestrial incursion and crash occurred somewhere in Lost Forest, though the specific crash location was not mentioned. Certainly, an unfortunate oversight by the excited poster, I’m sure. Yet, this omission didn’t matter to Rusty and his friends who still insisted on initiating an expedition to locate the wreckage. And really, who would not be tempted? This could be a fun mystery, even if it isn’t about the environment.
Mark bribed Rusty into letting him come along with the gang. Rusty’s main rival, Robbie, objected, but the other boys overruled him. So off they went, guided by Mark and his trustworthy pocket compass. But here, Mark failed to teach the kids that a compass—on its own—is not a “finder” but merely a “direction locator”, thereby spreading misinformation that could lead to possible problems for the boys in the future. A negative mark for woodsman Mark Trail!
By Wednesday’s strip, the actual hiking began with an abandoned horsehead mask found on the trail in Friday’s strip. It didn’t appear that the gang had hiked very far or very long. In any event, the Saturday strip had Rusty thinking that the alien crash story was fake and he was ready to go home. Yet Mark was not so easily defeated and thought that something funny was going on, which required more investigation. I think Mark has an idea this was a prank and who the prankster might be. Do you? While you ponder this, let’s get in some nature education:

Sharks can be social animals and have BFFs. Okay, that’s nice to know. They’re not always lone killers, lurking just under the surface for female surfers trying to catch a wave.
Do sharks behave like us? Apparently so, but we sometimes use the term “shark” to refer to seedy characters (e.g., loan sharks) who take advantage of people, usually in dire straits. Or the term can refer to a member of a New York street gang that has a tendency to dance and sing in poor neighborhoods.
But I don’t get Mark’s final comment, other than as a bad pun.