BT21 UNIVERSE ANIMATION·YouTube
All episodes
2 seasons · 17 eps
Season 2
Busking Chimmy Episode 2
COOKY's Fight Night Episode 3
MANG's Rematch Episode 4
KOYA and the 'E-mail' Episode 5
Love–Spread It, How? Episode 6
The Ultimate Sacrifice Episode 7
BT21 BECOME BABY Episode 8
8 episodes in Season 2
Some details come from TheTVDB.