However , they are soon attacked by goo monsters , and Finn and Jake think that Bubblegum 's candy helper James ( voiced by Andy Merrill ) is hindering their rescue .
Finn and Jake accompany Princess Bubblegum on her study of the Desert of Wonders .
They are soon attacked by goo monsters , and Finn and Jake think that Princess Bubblegum 's candy helper James ( voiced by Andy Merrill ) is hindering their rescue .
Finn and Jake accompany Princess Bubblegum on her study of the Desert of Wonders .