Entei at your Own Risk (エンティと温泉の仲間たち！ Entei's Companions and the Hot Spring!) is the 50th episode of Pokémon: Master Quest.
As the heroes continue onwards to Mt. Moon, they stop at some hot springs. However, Ash triggers a trap, causing a boy named Nelson to think he was an Entei, as Nelson wants to catch it. Team Rocket comes and manages to foil Ash they have smoothies. However, Ash and his Pokémon escape the truck. Luckily, a Misdreavus manages to rescue Larvitar, which Ash dropped. Nelson arrives and offers Ash a battle, wanting to prove his strategy via Mean Look. Will Nelson capture Entei, and how will Team Rocket capture more Pokémon?
As the heroes continue towards Mt. Silver, Larvitar wakes up. Misty and Brock think it is time to see the world, causing Larvitar to be frightened at their presence. Ash comforts Larvitar, thinking Misty can be scary at times and cuddles it. Misty and Brock tell Ash he should raise it to be a tougher Pokémon. Ash still thinks it is a bit nervous, but agrees they need to see how it reacts to other Pokémon. Suddenly, an Ursaring appears, who uses Hyper Beam to scare the heroes away. After being chased, the heroes notice some hot springs. Ash goes near them, triggering a trap. A boy comes, thinking it is Entei, but sees it is not.
The boy tells he wants to capture Entei. He researched where Entei was encountered and made alarms to detect its presence. The boy is Nelson, while Ash introduces himself, Misty and Brock. The Ursaring appears and jumps into the hot spring, so Nelson explains the hot springs calm down and heal Pokémon. As Nelson goes to check other sites, Ash sends his Pokémon to relax in the hot springs. However, before they do, he introduces Larvitar to the Pokémon. However, Larvitar is shy and frightened, so uses Screech. Later, Ash's Pokémon are in the hot springs, while Ash tells they are Larvitar's friends.
Misty sends her Pokémon, who go bath, but Psyduck cannot swim, so its splashes make Larvitar uncomfortable. Brock sends his Crobat and Pineco, who swim. Misty notices Psyduck in sand, while Brock feels the sand being warm. Brock sends Onix and Geodude, the latter pushing Larvitar into sand, which makes it comfortable. The Pokémon gather around Larvitar and start to throw sand balls at each other. One hits Larvitar, who screeches out. Team Rocket watches and Meowth has an "Afterbath smoothy" plan. Team Rocket comes to the heroes (disguised) and offer free smoothies after this bath. Misty and Brock are a bit suspicious, but Ash enters the truck with his Pokémon. Just then Team Rocket drives off in the truck.
Ash's Pokémon try to tackle the truck doors. Since that did not work, Pikachu uses Thunderbolt, but manages to electrocute everyone but Team Rocket. Bayleef uses Razor Leaf, but nothing happens. Cyndaquil uses Flamethrower and Totodile Water Gun and repeat the moves once more. Bayleef uses Razor Leaf to destory the door, then uses Vine Whip to take Ash out. Everyone manages to get to safety, successfully escaping the truck but Ash drops Larvitar. However, a Misdreavus catches it, saving its life. Nelson comes after Misdreavus, while Misty and Brock arrive as well. Nelson plans on using Misdreavus' move to capture Entei. Ash wants a bit of practice before the League and challenges Nelson to a battle.
Team Rocket sees the twerp got away, but Meowth thinks they have the smoothies, at least. Nelson sends Misdreavus and Ash sends Phanpy. Misdreavus starts with Headbutt, while Phanpy uses Take Down, hitting Misdreavus. Misdreavus uses Swift, but Phanpy's Defense Curl deflects the attack. Misdreavus uses Psybeam, while Phanpy rolls out, but gets hit and confused. Misdreavus uses Mean Look, though Ash does not see any difference. Seeing it confused, Ash calls Phanpy back, but Mean Look prevents that, also makes sure that wild Pokémon do not get away. Suddenly, Team Rocket captures Misdreavus, then uses a machine to suck all Pokémon into their balloon. Pineco gets sucked up, so Brock goes to save it. Brock manages to get it, but the Ursaring bumps into him, causing Brock to lose Pineco.
Pineco saw this act and evolves into Forretress, who stops the machine. Bayleef uses Razor Leaf, cutting the net and freeing Misdreavus. Meowth presses a button, using quite much power to suck the water, which can destroy the hot springs. Pokémon attack this tornado, though they don't make much effort. However, Nelson picks up a signal, and, from a distance, Flamethrower is used, causing the tornado to be stopped and Team Rocket blast off. Team Rocket ask for forgiveness from this Entei, who simply blasts them off. Nelson sends Misdreavus to battle Entei, using Mean Look on it. Misdreavus continues with Swift, but it does not seem to affect it. Misdreavus uses Psybeam, but it makes no impact. Misdreavus tries to headbutt, but Entei roars, causing Misdreavus to return back to its Poké Ball.
Entei leaves, causing Nelson to be sad, as He never expected Entei to use Roar to counter Misdreavus' Mean Look. However, he is much more willing to capture Entei, so the heroes believe he will do that one day. Later, the heroes continue the journey. While Larvitar managed to befriend the other Pokémon, it is still afraid of Brock and Misty.
- The "Who's that Pokémon?" is Tyrogue.
- The English episode title is a reference to warning sign "Enter at your own risk".
When Pikachu used Thunderbolt to try to escape Team Rocket's truck, Ash and every one of Pokemon are zapped, including Phanpy and Larvitar, who are supposed to be immune to Electric attacks.