S01E03 — Visitors from Outer Space

Hamburglar tricks the gang into believing that aliens have come to Earth so that he can steal McDonaldland's hamburgers without interference from them, which costs him their trust in him when they find out. Later, Hamburglar gets abducted by real aliens after foolishly accepting an offer to go on vacation with them, not realizing until too late that the vacation lasts thousands of Earth years. Despite being angry at him for his lie and prank, Ronald and his friends go on a mission in outer space to rescue Hamburglar.