9 books in series

Ricky Ricotta

Ricky Ricotta is a 6-book series with 9 primary works first released in 1994 with contributions by Dav Pilkey and Dav Polkey.

Ricky Ricotta's Mighty Robot
Ricky Ricotta's Mighty Robot vs. the Mutant Mosquitoes from Mercury
Ricky Ricotta's Giant Robot vs. the Voodoo Vultures from Venus
Ricky Ricotta's Mighty Robot Vs. the Mecha-Monkeys from Mars
Ricky Ricotta's Mighty Robot Vs. The Jurassic Jackrabbits From Jupiter
Ricky Ricotta's Mighty Robot vs. the Stupid Stinkbugs from Saturn
Ricky Ricotta's Mighty Robot vs. the Uranium Unicorns from Uranus
Ricky Ricotta's Mighty Robot vs. The Naughty Nightcrawlers From Neptune
Ricky Ricotta's Mighty Robot vs. the Unpleasant Penguins from Pluto