Sam & Max 204: Chariots of the Dogs

After Flint Paper informs Sam & Max that Bosco has gone missing, the three of them bust into his store to look for clues. After messing around in the back room a bit, Sam and Max are abducted by a UFO themselves (Flint Paper is left behind). On board they quickly find Bosco, who has turned into a cow! As they soon find out, the UFO harbors a time traveling elevator which Bosco has stumbled into making him inadvertently alter his own past before he was born.