There are 14 Episodes in Lego Dimensions. I'm taking a look at Episode 9: The Phantom Zone. This is the Ghostbusters themed Dimension in Lego Dimensions. Getting all Minikits will get you one yellow Lego Brick.
"The Phantom Zone" Minikits can all be collected by "Wave 1" Minifigures. Minifigures that have been released together with the Starter Pack. Either as Fun Packs or Level Packs.
Abilities and Minifigures you will need to collect all Minikits in The Phantom Zone. I am completing this list here with Minifigures that are not released yet, in case you are tackling this at a later stage. Of course you will only need one of those Minifigures to perform the ability and a Minifigure has more than one ability :
Is part of the Back to the Future Level Pack together with Marty McFly.