Meet Albedo

'Characters'
'Ben Jr.'

'Ben 10000'

'Julie Yamamoto'

'Max'

Magister Ghanos

'Villains'
Albedo (Only in this episode, then it turns into an ally)

'Aliens Used By Ben Jr.'
'Swampfire'

Beast

'Aliens Used By Ben 1000'
'Artiguana' (X2)

'Rath'

Four Arms

Spidermonkey / Ultimate Spidermonkey

'Aliens Used By Albedo'
'Negative' Big Chill

Negative Goop

Negative Diamondhead

Negative Stencil

By Albedo
Negative Stencil

By Ben Jr.
Beast

'Major Events'
'Albedo Returns' !

Ben Jr. meet Albedo

Ben Jr. first transformation into Swampfire and Beast

Ben Jr. releases Beast

Albedo releases Negative Stencil

Albedo becomes ally of Ben Jr. and Ben 10000

Characters Debuts
Magister Ghanos

Max

'Villans Debuts'
Albedo (Only in this episode, then it turns into an ally) (First appearance in Ben Jr. 10 - Ultimate Alien)

Alfhatrix Debuts
Swampfire

Beast

Ultimatrix Debuts
Rath

Four Arms

Negative Ultimatrix Debuts
Negative Big Chill

Negative Goop

Negative Stencil

'Notes'
When Albedo saw Goop, he shouts the name of the alien as Ben 10,000 and Ben Jr.

Ben 10,000 uses the code of self-destruction (000-destroy-0) but it esquese disabling but not explode Ultimatrix Negative