Captain Underpants tries to stop them, but his cape gets caught on their van.

Captain Underpants uses the rest of the toilet paper to swing to safety.

Captain Underpants suddenly appears, and the introduction comes in.

Captain Underpants decides to rapidly shoot underwear at the monster, but it doesn't work.

There was a boxed set of four books about a character called Captain Underpants ($17.95).

Here she was again: Captain Underpants's sidekick, showing them all up.

Captain Underpants, despite the fact that he doesn't have super-powers, decides to go after the robo-boogers.

The boys temporarily defeat the aliens and by that time Captain Underpants has returned.

Captain Underpants appears and places plungers in the toilets' mouths so they cannot eat anymore.

They were completely destroyed by Captain Underpants when he used the Harold 2000's own hands against them.