Check out the Ricky Ricotta's Mighty Robot Series!

Ricky Ricotta's Mighty Robot vs. the Mecha-Monkeys from Mars
Ricky Ricotta's Mighty Robot vs. the Voodoo Vultures from Venus
Ricky Ricotta's Mighty Robot vs. the Mutant Mosquitoes from Mercury
Ricky Ricotta's Mighty Robot
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 Naughty Nightcrawlers From Neptune (Book #8)

Ricky Ricotta's Mighty Robot vs. The Unpleasant Penguins from Pluto (Book #9)