Dagobah is referred to as the Bog planet and Luke is comatose as he approaches it, thanks to Vader Force-choking him from afar. There he meets a “frog-like” creature named Minch (Yoda). Bog was a training center for young Jedi, and that’s where Obi-Wan trained. Later on, Minch demonstrates a Jedi duel, calling upon Obi-Wan (”By the Force, I call you!” Minch says, summoning Obi-Wan) to be his opponent.