Digimon Tamers Episode 20
Dub Name: Out of the Blue
Japanese Name: This is the Trump Card! The Blue Card of Friendship

Summary:
Indaramon knocks Impmon away easily. Yamaki activates Juggernaught which sends causes Indaramon to disappear. Yamaki than gets all of the original team of students that created the digimon except Shibumi to join Hypnos. He convinces them that digimon are evil and need to be destroyed, that they are no longer just their creation, that an evil digimon is controlling them. Indaramon returns and all the digimon digivolve to champion but it's no use, he's still too powerful. Earlier Kazu drew a blue card in a hope that it would make him a tamer. Takato swipes it and Growlmon Matrix digivolves to Wargrowlmon and deletes Indaramon. All of this is seen by Makuramon who comes to realise that Calumon is the secret to the digivolutions.