Need some help - Voyage to the Bottom of the Sea/book

[Batman's Superior Cousin]

1) This episode has a sea giant thats can walk and breath underwater.

2) This one has the crew arriving at a deserted US city. They could voices but couldn't see anyone.

3) This had the crew battling humans who turned into man-sized toy soldiers by a mad scientist type.

1) A book about aliens that look like mini sprouts. They launch an invasion by going inside human noses and making the host love . Please Help!!!

[worldshown]

The book could be part of the Armageddon trilogy by Robert Rankin. Was one of these sprouts called Barry?